, the House of Representatives of Japan is elected from a combination of multi-member districts and single-member districts, a method called Parallel voting. Currently, 176 members are elected from 11 multi-member districts (called proportional representation blocks or PR blocks) by a party-list system of proportional representation (PR), and 289 members are elected from single-member districts, for a total of 465. 233 seats are therefore required for a majority. Each PR block consists of one or more prefectures, and each prefecture is divided into one or more single-member districts. In general, the block districts correspond loosely to the major regions of Japan, with some of the larger regions (such as Kantō) subdivided.
See main article: 1994 Japanese electoral reform. Until the 1993 general election, all members of the House of Representatives were elected in multi-member constituencies by single non-transferable vote. In 1994, Parliament passed an electoral reform bill that introduced the current system of parallel voting in single-member constituencies and proportional voting blocks.[1] The original draft bill in 1993 by the anti-LDP coalition of Prime Minister Morihiro Hosokawa included proportional party list voting on a national scale, an equal number of proportional and district seats (250 each) and the possibility of split voting. However, the bill stalled in the House of Councillors.[2] After the Liberal Democratic Party (LDP) had returned to power later that year, it was changed to include proportional voting in regional blocks only, the number of proportional seats was reduced, but the possibility to cast two separate votes was kept in the bill. The electoral reform law was finally passed in 1994. It was first applied in the 1996 general election.
Amendments to the electoral law in 2002[3] and 2013[4] changed the boundaries of single-member districts and reapportioned seats between prefectures (+5/-5 in 2002; +0/-5 in 2013, resulting in a net change of -5 in district seats in the House of Representatives to 295 and overall seats to 475). The borders of the regional proportional blocks have never changed, but the apportionment of seats to the regional proportional blocks changed in 2000 after the number of proportional seats had been reduced from 200 to 180 (reducing the total number of seats in the lower house from 500 to 480),[5] and in the 2002 reapportionment.
Another reapportionment was passed by the National Diet in June 2017. In the majoritarian segment, it will change 97 districts in 19 prefectures, six are eliminated without replacement (one each in Aomori, Iwate, Mie, Nara, Kumamoto and Kagoshima). In the proportional segment, four "blocks" lose a seat each (Tōhoku, N. Kantō, Kinki, Kyūshū). Thus, the number of majoritarian seats is reduced to 289, the number of proportional seats to 176, the House of Representatives overall shrinks to 465. The reform takes effect one month after promulgation, i.e. on July 16, 2017.[6] [7]
The block constituency for Hokkaidō (比例北海道ブロック) elects 8 members proportionally. It contains only Hokkaidō Prefecture, which is divided into 12 single-member districts.
The block constituency for Tohoku (比例東北ブロック) elects 14 members proportionally. It corresponds to the Tohoku region.
| District 1 | City of Akita | 260,836 | Hiroyuki Togashi | LDP | |
| District 2 | Cities of Katagami, Kazuno, Kitaakita, Noshiro, Ōdate and OgaDistricts of Kazuno, Kitaakita, Minamiakita and Yamamoto | 255,369 | Takashi Midorikawa | CDP | |
| District 3 | Cities of Daisen, Nikaho, Semboku, Yokote, Yurihonjō and YuzawaDistricts of Ogachi and Senboku | 316,428 | Nobuhide Minorikawa | LDP | |
| District 1 | Cities of Aomori and MutsuDistrict of Higashitsugaru, Shimokita and part of district of Kamikita | 338,948 | Akinori Eto[19] | LDP | |
| District 2 | Cities of Hachinohe, Misawa and TowadaPart of district of Shimokita | 386,599 | Junichi Kanda[20] | LDP | |
| District 3 | Cities of Hirakawa, Hirosaki, Goshogawara, Kuroishi and TsugaruDistricts of Kitatsugaru, Minamitsugaru, Nakatsugaru and Nishitsugaru | 344,106 | Jiro Kimura | LDP | |
| District 1 | 389,027 | Emi Kaneko | CDP | ||
| District 2 | Cities of Kōriyama, Sukagawa and Tamura | 431,889 | Takumi Nemoto | LDP | |
| District 3 | Cities of Aizuwakamatsu, Kitakata and Shirakawa District of Higashishirakawa, Kawanuma, Minamiaizu, Nishishirakawa, Ōnuma and Yama | 334,482 | Kōichirō Genba[21] | CDP | |
| District 4 | Cities of Iwaki, Minamisōma and Sōma | 408,290 | Shinji Oguma | CDP | |
| City of Morioka District of Shiwa | 292,500 | Takeshi Shina | CDP | ||
| 2nd district[22] | 364,234 | Shun'ichi Suzuki | LDP | ||
| 3rd district | Cities of Hanamaki, Ichinoseki, Kitakami, and Oshu Districts of Isawa, Nishiiwai, and Waga | 374,393 | Takashi Fujiwara[23] | LDP | |
| 1st district | Sendai, wards of Aoba-ku and Taihaku-ku | 445,778 | Tōru Doi[24] | LDP | |
| 2nd district | Sendai, wards of Izumi-ku, Miyagino-ku and Wakabayashi-ku | 456,564 | Sayuri Kamata | CDP | |
| 3rd district | Cities of Iwanuma, Kakuda, Natori, and Shiroishi Districts of Igu, Katta, Shibata, and Watari | 282,793 | Akihiro Nishimura | LDP | |
| 4th district | Cities of Higashimatsushima, Ishinomaki, Shiogama, Tagajō, and Tomiya Districts of Kurokawa, Miyagi, and Oshika | 388,880 | Shintaro Ito | LDP | |
| 5th district | Cities of Kesennuma, Kurihara, Ōsaki, and Tome Districts of Kami, Motoyoshi, and Tōda | 349,841 | Jun Azumi | CDP | |
| 1st district | Cities of Kaminoyama, Tendō, and Yamagata District of Higashimurayama | 302,702 | Toshiaki Endo | LDP | |
| 2nd district | Cities of Higashine, Murayama, Nagai, Nan'yō, Obanazawa, Sagae, and Yonezawa Districts of Higashiokitama, Kitamurayama, Nishimurayama, and Nishiokitama | 311,389 | Norikazu Suzuki | LDP | |
| 3rd district | Cities of Sakata, Shinjō, and Tsuruoka Districts of Akumi, Higashitagawa, and Mogami | 284,580 | Ayuko Kato | LDP | |
The Northern Kanto proportional representation block (北関東) elects 20 members proportionally. It includes four prefectures in northern Kanto.
| 1st district | Cities of Maebashi and Numata District of Tone | 345,119 | Yasutaka Nakasone | LDP | |
| 2nd district | Cities of Isesaki, Kiryū, and Midori District Sawa | 331,700 | Toshiro Ino | LDP | |
| 3rd district | Cities of Ōta and Tatebayashi District of Oura | 320,516 | Hiroyoshi Sasakawa | LDP | |
| 4th district | Cities of Fujioka and part of Takasaki District of Tano | 295,213 | Tatsuo Fukuda | LDP | |
| 5th district | Cities of Annaka, Shibukawa, Tomioka, and part of Takasaki Districts of Agatsuma, Kanra, and Kitagunma | 317,654 | Yūko Obuchi | LDP | |
| 1st district | Cities of Chikusei, Kasama, Mito, and Sakuragawa District of Higashiibaraki (Town of Shirosato) | 426,105 | Nobuyuki Fukushima | YK | |
| 2nd district | Cities of Hokota, Itako, Kashima, Kamisu, Namegata, and Omitama District of Higashiibaraki (Towns of Ibaraki and Ōarai) | 304,799 | Fukushiro Nukaga | LDP | |
| 3rd district | Cities of Inashiki, Moriya, Ryūgasaki, Toride, and Ushiku | 390,263 | Yasuhiro Hanashi[25] | LDP | |
| 4th district | Cities of Hitachinaka, Hitachiōmiya, Hitachiōta, and Naka District of Kuji | 269,983 | Hiroshi Kajiyama | LDP | |
| 5th district | Cities of Hitachi, Kitaibaraki, and TakahagiDistrict of Naka | 240,104 | Satoshi Asano | DPFP | |
| 6th district | Cities of Ishioka, Kasumigaura, Tsuchiura, Tsukuba, and Tsukubamirai | 452,377 | Ayano Kunimitsu | LDP | |
| 7th district | Cities of Bandō, Jōsō, Koga, Shimotsuma and Yuki | 330,072 | Keiko Nagaoka | LDP | |
| 1st district | Saitama, wards of Midori-ku, Minuma, and Urawa-ku | 382,839 | Hideki Murai | LDP | |
| 2nd district | Part of city of Kawaguchi | 391,718 | Yoshitaka Shindō[26] | LDP | |
| 3rd district | Cities of Koshigaya and part of Kawaguchi | 381,903 | Hitoshi Kikawada | LDP | |
| 4th district | Cities of Asaka, Niiza, Shiki, and Wakō | 388,488 | Yasushi Hosaka | LDP | |
| 5th district | Saitama, wards of Chūō-ku, Kita-ku, Nishi-ku and Ōmiya-ku | 393,216 | Yukio Edano | CDP | |
| 6th district | Cities of Ageo, Kitamoto, Kōnosu, and Okegawa | 415,349 | Atsushi Ōshima | CDP | |
| 7th district | Cities of Fujimi and Kawagoe | 388,546 | Hideyuki Nakano | LDP | |
| 8th district | Cities of Fujimino, and Tokorozawa District of Iruma (Town of Miyoshi) | 418,267 | Masahiko Shibayama | LDP | |
| 9th district | Cities of Hannō, Hidaka, Iruma, and SayamaDistrict of Iruma (Towns of Moroyama and Ogose) | 404,883 | Taku Ōtsuka | LDP | |
| 10th district | Cities of Higashimatsuyama, Sakado, and TsurugashimaDistrict of Hiki | 328,662 | Susumu Yamaguchi | LDP | |
| 11th district | Cities of Chichibu, Fukaya, and HonjōDistricts of Chichibu, Kodama, and Ōsato | 340,853 | Ryūji Koizumi | LDP | |
| 12th district | Cities of Gyōda, Hanyū, Kazo, and Kumagaya | 372,546 | Toshikazu Morita | CDP | |
| 13th district | Cities of Hasuda, Kuki, Satte, and ShiraokaDistricts of Kita-Adachi, Kitakatsushika (Town of Sugito), and Minamisaitama | 372,386 | Shinako Tsuchiya | LDP | |
| 14th district | Cities of Misato, Sōka, and Yashio | 402,229 | Hiromi Mitsubayashi | LDP | |
| 15th district | Saitama, wards of Minami-ku and Sakura-kuCities Toda and Warabi | 411,169 | Ryōsei Tanaka | LDP | |
| 16th district[27] | Saitama, ward of Iwatsuki-kuCities of Kasukabe and YoshikawaDistrict of Kitakatsushika (Town of Matsubushi) | 377,417 | To be determined in 2025 |
| 1st district | Part of city of Utsunomiya | 418,287 | Hajime Funada | LDP | |
| 2nd district | Cities of Kanuma, Nikkō, Sakura, and part of Utsunomiya District of Shioya | 256,007 | Akio Fukuda | CDP | |
| 3rd district | Cities of Nasukarasuyama, Nasushiobara, Ōtawara, and Yaita District of Nasu | 240,132 | Kazuo Yana | LDP | |
| 4th district | Cities of Mooka, Oyama, and Shimotsuke Districts of Haga and Shimotsuga | 357,326 | Tsutomu Sato | LDP | |
| 5th district | Cities of Ashikaga, Sano, and Tochigi | 349,651 | Toshimitsu Motegi | LDP | |
The block constituency for southern Kanto (比例南関東ブロック, hirei minami-Kantō burokku) elects 22 members proportionally. It includes two prefectures in southern Kanto and one in eastern Chubu.
| 1st district | Chiba, wards of Chūō-ku, Inage-ku, and Mihama-ku | 433,793 | Kaname Tajima | CDP | |
| 2nd district | Chiba, ward of Hanamigawa-kuCity Yachiyo | 317,682 | Takayuki Kobayashi | LDP | |
| 3rd district | Chiba, ward of Midori-kuCity of Ichihara | 336,547 | Hirokazu Matsuno | LDP | |
| 4th district | Part of the cities of Funabashi, Ichikawa | 405,337 | Yoshihiko Noda | CDP | |
| 5th district | Cities of Urayasu, and part of Ichikawa | 413,484 | Arfiya Eri | LDP | |
| 6th district | City of Matsudo | 416,215 | Hiromichi Watanabe | LDP | |
| 7th district | Cities of Nagareyama and Noda | 294,531 | Ken Saitō | LDP | |
| 8th district | City of Kashiwa | 358,485 | Satoshi Honjo | CDP | |
| 9th district | Chiba, ward of Wakaba-kuCities of Sakura, Yachimata, and Yotsukaidō | 407,318 | Soichiro Okuno | CDP | |
| 10th district | Cities of Asahi, Chōshi, Katori, Narita, and SōsaDistricts of Katori | 329,853 | Motoo Hayashi | LDP | |
| 11th district | 358,264 | Eisuke Mori | LDP | ||
| 12th district | 379,663 | Yasukazu Hamada | LDP | ||
| 13th district[28] | Cities of Abiko, Inzai, Kamagaya, Shiroi, and TomisatoDistrict of Iba | 418,355 | Hisashi Matsumoto | LDP | |
| 14th district | Cities of Narashino and part of Funabashi | 414,157 | To be determined in 2025 |
| Yokohama, wards of Naka-ku, Isogo-ku, and Kanazawa-ku | 428,275 | Go Shinohara | CDP | ||
| 2nd district | Yokohama, wards of Kōnan-ku, Minami-ku, and Nishi-ku | 437,432 | Yoshihide Suga | LDP | |
| 3rd district | Yokohama, wards of Kanagawa-ku and Tsurumi-ku | 444,993 | Kenji Nakanishi | LDP | |
| 4th district | Yokohama, ward of Sakae-kuCities of Kamakura and Zushi Districts of Miura | 333,935 | Yuki Waseda | CDP | |
| 5th district | Yokohama, wards of Izumi-ku and Totsuka-ku | 364,557 | Manabu Sakai | LDP | |
| 6th district | Yokohama, wards of Asahi-ku and Hodogaya-ku | 380,871 | Naoki Furukawa | LDP | |
| 7th district | Yokohama, ward of Kōhoku-ku | 297,024 | Keisuke Suzuki | LDP | |
| 8th district | Yokohama, wards of Midori-ku and Aoba-ku | 410,538 | Kenji Eda | CDP | |
| 9th district | Kawasaki, wards of Asao-ku and Tama-ku | 333,522 | Hirofumi Ryu[29] | CDP | |
| 10th district | Kawasaki, wards of Kawasaki-ku and Saiwai-ku) | 330,420 | Kazunori Tanaka | LDP | |
| Cities of Miura and Yokosuka. | 372,364 | Shinjirō Koizumi | LDP | ||
| 12th district | City of FujisawaDistrict of Koza | 410,480 | Tomoko Abe | CDP | |
| 13th district | Yokohama, ward of Seya-kuCities of Ayase and Yamato | 373,756 | Hideshi Futori | CDP | |
| 14th district | Sagamihara, wards of Chūō-ku and Midori-kuDistrict of Aikō | 405,035 | Jiro Akama | LDP | |
| 15th district | Cities of Chigasaki and HiratsukaDistrict of Naka (Town of Ōiso) | 450,900 | Taro Kono | LDP | |
| 16th district | Cities of Atsugi, Ebina, and Isehara | 385,382 | Yuichi Goto | CDP | |
| 17th district | Cities of Hadano, Minamiashigara, and OdawaraDistricts of Ashigarakami, Ashigarashimo, and Naka (Town of Ninomiya) | 449,062 | Karen Makishima | LDP | |
| 18th district | Kawasaki, wards of Nakahara-ku and Takatsu-ku | 409,761 | Daishiro Yamagiwa | LDP | |
| 19th district | Kawasaki, ward of Miyamae-kuYokohama, ward of Tsuzuki-ku | 368,329 | To be determined in 2025 | ||
| 20th district | Sagamihara, ward of Minami-kuCity of Zama | 346,633 | To be determined in 2025 |
| District 1 | Cities of Kōfu, Nirasaki, Hokuto, Minami-arupusu, Chuo, Kai Districts of Nishiyatsushiro, Minamikoma, and Nakakoma | 424,557 | Shinichi Nakatani | LDP | |
| District 2 | Cities of Yamanashi, Fujiyoshida, Ōtsuki, Tsuru, Fuefuki, Koshu, and Uenohara Districts of Kitatsuru and Minamitsuru | 260,824 | Noriko Horiuchi | LDP |
The block constituency for Tokyo (比例東京ブロック) elects 17 members proportionally. It covers Tokyo prefecture.
| 1st district | Tokyo, wards of Chiyoda and Shinjuku | 332,256 | Miki Yamada | LDP | |
| 2nd district | Tokyo, wards of Chūō and Taitō | 312,165 | Kiyoto Tsuji | LDP | |
| 3rd district | Tokyo, part of the ward of Shinagawa. | 361,015 | Jin Matsubara | CDP | |
| 4th district | Tokyo, part of the ward of Ōta | 425,428 | Masaaki Taira | LDP | |
| 5th district | Tokyo, part of the ward of Setagaya | 375,790 | Yoshio Tezuka | CDP | |
| 6th district | Tokyo, part of the ward of Setagaya | 400,236 | Takayuki Ochiai | CDP | |
| 7th district | Tokyo, part of the ward of Setagaya | 400,527 | Akira Nagatsuma | CDP | |
| 8th district | Tokyo, wards of Minato and Shibuya | 391,474 | Harumi Yoshida | CDP | |
| 9th district | Tokyo, part of the ward of Nerima | 307,649 | Issei Yamagishi | CDP | |
| 10th district | Tokyo, wards of Bunkyō and Toshima | 419,486 | Hayato Suzuki | LDP | |
| 11th district | Tokyo, part of the ward of Itabashi | 388,347 | Hakubun Shimomura | LDP | |
| 12th district | Tokyo, wards of Kita and part of Itabashi | 378,264 | Mitsunari Okamoto | Komeito | |
| 13th district | Tokyo, part of the ward of Adachi | 387,664 | Shin Tsuchida | LDP | |
| 14th district | Tokyo, wards of Sumida and part of Edogawa | 402,475 | Midori Matsushima | LDP | |
| 15th district | Tokyo, ward of Kōtō | 427,908 | Mito Kakizawa | LDP | |
| 16th district | Tokyo, part of the ward of Edogawa | 391,972 | Hideo Ōnishi | LDP | |
| 17th district | Tokyo, ward of Katsushika | 383,277 | Katsuei Hirasawa | LDP | |
| 18th district | Cities of Musashino, Nishitokyo, and Koganei. | 402,332 | Naoto Kan | CDP | |
| 19th district | Cities of Kodaira, Kokubunji, and Kunitachi | 334,159 | Yoshinori Suematsu | CDP | |
| 20th district | Cities of Higashimurayama, Higashiyamato, Kiyose, Higashikurume, and Musashimurayama | 419,465 | Seiji Kihara | LDP | |
| 21st district | Cities of Hino, Tachikawa, and part Hachiōji | 405,407 | Kiyoshi Odawara | LDP | |
| 22nd district | Cities of Chōfu, Komae, and Mitaka | 430,620 | Tatsuya Ito | LDP | |
| 23rd district | 362,390 | Masanobu Ogura | LDP | ||
| 24th district | Part of the city of Hachiōji. | 382,675 | Kōichi Hagiuda | LDP | |
| 25th district | Cities of Akiruno, Akishima, Fussa, Hamura, and Ōme District of Nishitama | 414,091 | Shinji Inoue | LDP | |
| 26th district | Tokyo, wards of Meguro and part of Ōta | 430,474 | To be determined in 2025 | ||
| 27th district | Tokyo, wards of Nakano and part of Suginami | 383,510 | To be determined in 2025 | ||
| 28th district | Tokyo, part of the ward of Nerima | 313,718 | To be determined in 2025 | ||
| 29th district | Tokyo, wards of Arakawa and part of Adachi | 355,778 | To be determined in 2025 | ||
| 30th district | Cities of Fuchū, Inagi, and Tama | 419,168 | To be determined in 2025 |
The block constituency for Hokurikushinetsu (北陸信越) elects 11 members proportionally. It combines five prefectures of the Hokuriku and Shin'etsu subregions in northern Chubu.
| 1st district | Cities of Awara, Fukui, Katsuyama, Ono, and SakaiDistrict of Yoshida | 373,417 | Tomomi Inada | LDP | |
| 2nd district | Cities of Echizen, Obama, Sabae, and Tsuruga Districts of Imadate, Mikata, Minamikaminaka, Nanjō, Nyū, and Ōi | 261,145 | Tsuyoshi Takagi | LDP | |
| 1st district | City of Kanazawa | 376,016 | Takuo Komori | LDP | |
| 2nd district | Cities of Hakusan, Kaga, Komatsu, Nomi, and NonoichiDistrict of Nomi | 325,277 | Hajime Sasaki | LDP | |
| 3rd district | Cities of Hakui, Kahoku, Nanao, Suzu, and Wajima.Districts of Hakui, Hōsu, Kahoku, and Kashima. | 241,238 | Shoji Nishida | LDP | |
| 1st district | Niigata, wards of Chūō-ku, Higashi-ku, and Kōnan-kuCity of Sado | 365,049 | Chinami Nishimura | CDP | |
| 2nd district | Niigata, wards of Minami-ku, Nishi-ku, and Nishikan-kuCities of Sanjō, Kamo, and Tsubame Districts of Minamikanbara and Nishikanbara | 402,082 | Kenichi Hosoda | LDP | |
| 3rd district | Niigata, wards of Akiha-ku and Kita-kuCities of Agano, Gosen, Murakami, Shibata, and Tainai Districts of Higashikanbara, Iwafune, and Kitakanbara | 381,835 | Hiroaki Saito | LDP | |
| 4th district | Cities of Kashiwazaki, Mitsuke, Nagaoka, and OjiyaDistrict of Kariwa and Santō | 362,100 | Makiko Kikuta | CDP | |
| 5th district | Cities of Itoigawa, Jōetsu, Minamiuonuma, Myōkō, Uonuma, and TōkamachiDistricts of Minamiuonuma and Nakauonuma | 352,135 | Ryuichi Yoneyama | CDP | |
| 1st district | Cities of Iiyama, Nakano, Suzaka, and part of NaganoDistricts of Kamitakai, Shimominochi, and Shimotakai | 424,275 | Kenta Wakabayashi | LDP | |
| 2nd district | Cities of Azumino, Matsumoto and Ōmachi, and part of NaganoDistricts of Higashichikuma, Kamiminochi, and Kitaazumi | 381,349 | Mitsu Shimojo | CDP | |
| 3rd district | Cities of Chikuma, Komoro, Saku, Tōmi and UedaDistricts of Chiisagata, Hanishina, Kitasaku, and Minamisaku | 398,639 | Yosei Ide | LDP | |
| 4th district | Cities of Chino, Okaya, Shiojiri, and SuwaDistricts of Kiso and Suwa | 239,642 | Shigeyuki Goto | LDP | |
| 5th district | Cities of Iida, Ina and KomaganeDistricts of Kamiina and Shimoina | 278,839 | Ichiro Miyashita | LDP | |
| 1st district | Part of the city of Toyama | 267,663 | Hiroaki Tabata | LDP | |
| 2nd district | Cities of Kurobe, Namerikawa, Uozu, and part of ToyamaDistricts of Nakaniikawa and Shimoniikawa. | 245,898 | Eishun Ueda[30] | LDP | |
| 3rd district | Cities of Himi, Imizu, Nanto, Oyabe, Takaoka, and Tonami | 362,175 | Keiichiro Tachibana | LDP | |
The block constituency for Tokai (東海) elects 21 members proportionally. It covers three prefectures in southern Chubu, as well as one prefecture in Kinki.
| 1st district | 403,902 | Hiromichi Kumada | LDP | ||
| 2nd district | 404,844 | Motohisa Furukawa | DPFP | ||
| 3rd district | 418,407 | Shoichi Kondo | CDP | ||
| 4th district | Nagoya, wards of Mizuho, Atsuta, Minato and Minami. | 371,387 | Shozo Kudo | LDP | |
| 5th district | 350,279 | Kenji Kanda | LDP | ||
| 6th district | Cities of Kasugai and Seto | 359,295 | Hideki Niwa | LDP | |
| 7th district | Cities of Nagakute, Nisshin, Ōbu, Owariasahi, and ToyoakeDistrict of Aichi | 354,150 | Junji Suzuki | LDP | |
| 8th district | Cities of Handa, Tokoname, Tōkai and ChitaDistrict of Chita | 437,388 | Tadahiko Ito | LDP | |
| 9th district | Cities of Ama, Aisai, Inazawa, Tsushima, and YatomiDistrict of Ama | 383,431 | Yasumasa Nagasaka | LDP | |
| 10th district | Cities of Ichinomiya and Iwakura | 354,248 | Tetsuma Esaki | LDP | |
| 11th district | Cities of Miyoshi and Toyota | 386,121 | Tetsuya Yagi | LDP | |
| 12th district | Cities of Okazaki and Nishio | 445,465 | Kazuhiko Shigetoku | CDP | |
| 13th district | Cities of Hekinan, Kariya, Anjō, Chiryū, and Takahama | 424,402 | Kensuke Onishi | CDP | |
| 14th district | Cities of Toyokawa, Gamagōri, and ShinshiroDistrict of Nukata and Kitashitara | 294,065 | Soichiro Imaeda | LDP | |
| 15th district | Cities of Toyohashi and Tahara | 347,576 | Yukinori Nemoto | LDP | |
| 16th district | Cities of Kitanagoya, Komaki, Kōnan, and InuyamaDistrict of Nishikasugai and Niwa | 393,120 | To be determined in 2025 |
| 1st district | City of Gifu | 336,264 | Seiko Noda | LDP | |
| 2nd district | Cities of Ōgaki and KaizuDistricts of Anpachi, Fuwa, Ibi, and Yōrō | 298,922 | Yasufumi Tanahashi | LDP | |
| 3rd district | Cities of Hashima, Kakamigahara, Mino, Mizuho, Motosu, Seki, and YamagataDistricts of Hashima and Motosu | 411,722 | Yoji Muto | LDP | |
| 4th district | Cities of Gero, Gujō, Hida, Kani, Minokamo, and TakayamaDistrict of Kamo, Kani and Ōno | 327,816 | Shumpei Kaneko | LDP | |
| 5th district | Cities of Ena, Mizunami, Nakatsugawa, Tajimi, and Toki | 271,830 | Keiji Furuya | LDP | |
| 1st district | Cities of Matsuaka and Tsu | 358,042 | Norihisa Tamura | LDP | |
| 2nd district | Cities of Iga, Kameyama, Nabari, Suzuka, and part of Yokkaichi | 407,181 | Hideto Kawasaki | LDP | |
| 3rd district | Cities of Inabe, Kuwana, and part of YokkaichiDistricts of Inabe, Kuwana, and Mie | 414,798 | Katsuya Okada | CDP | |
| 4th district | Cities of Ise, Kumano, Owase, Toba, and ShimaDisitricts of Kitamuro, Minamimuro, Taki, and Watarai | 294,027 | Eikei Suzuki | LDP | |
| 1st district | Shizuoka, wards of Aoi and Suruga | 386,430 | Yōko Kamikawa | LDP | |
| 2nd district | Cities of Fujieda, Makinohara, Shimada, and YaizuDistrict of Haibara | 378,801 | Tatsunori Ibayashi | LDP | |
| 3rd district | Cities Fukuroi, Iwata, Kakegawa, Kikugawa, and Omaezaki District of Shūchi | 375,422 | Nobuhiro Koyama | CDP | |
| 4th district | Shizuoka, ward of Shimizu-ku Cities of Fujinomiya and part of Fuji | 318,744 | Yoichi Fukazawa | LDP | |
| 5th district | Cities of Gotemba, Mishima, Susono, and part of FujiDistricts of Tagata and Suntō (Towns of Oyama) | 455,231 | Goshi Hosono | LDP | |
| 6th district | Cities of Atami, Itō, Izu, Izunokuni, Numazu, and ShimodaDistricts | 434,785 | Takaaki Katsumata | LDP | |
| 7th district | Hamamatsu, wards of Hamakita, Kita-ku, Nishi-ku, and TenryūCity of Kosai | 316,233 | Minoru Kiuchi | LDP | |
| 8th district | Hamamatsu, wards of Higashi, Minami, and Naka | 382,752 | Kentaro Gemma | CDP | |
The block constituency for Kinki (Kansai) (近畿) elects 29 members proportionally. It corresponds to the Kinki region minus Mie Prefecture.
| 1st district | Kobe, wards of Chūō-ku, Higashinada-ku, and Nada-ku | 394,037 | Nobuhiko Isaka | CDP | |
| 2nd district | Kobe, wards of Hyōgo-ku, Kita-ku, and Nagata-kuPart of the city of Nishinomiya | 385,407 | Kazuyoshi Akaba | Komeito | |
| 3rd district | Kobe, wards of Suma-ku and Tarumi-ku | 313,392 | Yoshihiro Seki | LDP | |
| 4th district | Kobe, ward of Nishi-kuCities of Kasai, Katō, Miki, Nishiwaki, and OnoDistrict of Taka | 419,227 | Hisayuki Fujii | LDP | |
| 5th district | Cities of Asago, Sanda, Tamba, Tamba-Sasayama, Toyooka, Yabu, and part of KawanishiDistricts of Kawabe and Mikata | 381,054 | Koichi Tani | LDP | |
| 6th district | Cities of Itami, Takarazuka, and part of Kawanishi | 449,512 | Koichiro Ichimura | Nippon Ishin | |
| 7th district | Cities of Ashiya and part of Nishinomiya | 443,422 | Kenji Yamada | LDP | |
| 8th district | City of Amagasaki | 386,380 | Hiromasa Nakano | Komeito | |
| 9th district | Cities of Akashi, Awaji, Minamiawaji, and Sumoto | 363,654 | Yasutoshi Nishimura | LDP | |
| 10th district | Cities of Kakogawa and TakasagoDistrict of Kako | 347,377 | Kisaburo Tokai | LDP | |
| 11th district | Part of the city of Himeji | 399,004 | Takeaki Matsumoto | LDP | |
| 12th district | Cities of Aioi, Ako, Shiso, Tatsuno, and part of HimejiDistricts of Akō, Ibo, Kanzaki, and Sayō | 282,431 | Tsuyoshi Yamaguchi | LDP | |
| 1st district | Kyoto, wards of Kamigyō-ku, Kita-ku, Nakagyō-ku, Minami-ku, and Shimogyō-ku | 390,269 | Yasushi Katsume | LDP | |
| 2nd district | Kyoto, wards of Higashiyama-ku, Sakyō-ku, and Yamashina-ku | 263,524 | Seiji Maehara | DPFP | |
| 3rd district | Kyoto, ward of Fushimi-kuCities of Mukō and NagaokakyōDistrict of Otokuni | 353,363 | Kenta Izumi | CDP | |
| 4th district | Kyoto, wards of Nishikyō-ku and Ukyō-kuCities of Kameoka and NantanDistrict of Funai | 394,845 | Keiro Kitagami | YK | |
| 5th district | Vities of Ayabe, Fukuchiyama, Kyōtango, Maizuru, and MiyazuDistrict of Yosa | 236,343 | Taro Honda | LDP | |
| 6th district | Cities of Joyo, Kizugawa, Kyōtanabe, Uji, and YawataDistricts of Kuse, Sōraku, and Tsuzuki | 459,643 | Kazunori Yamanoi | CDP | |
| 1st district | 394,347 | Sumio Mabuchi | CDP | ||
| 2nd district | Cities of Kashiba, Tenri, Yamatokōriyama, and part of NaraDistricts of Ikoma, Kitakatsuragi, Shiki, and Yamabe | 382,819 | Sanae Takaichi | LDP | |
| 3rd district | Cities of Gojō, Gose, Kashihara, Katsuragi, Sakurai, Uda and YamatotakadaDistricts of Takaichi, Uda, and Yoshino | 352,656 | Taido Tanose | LDP | |
| 1st district | Osaka, wards of Chūō-ku, Higashinari-ku, Minato-ku, Naniwa-ku, Nishi-ku, and Tennōji-ku | 433,378 | Hidetaka Inoue | Nippon Ishin | |
| 2nd district | Osaka, wards of Abeno-ku, Higashisumiyoshi-ku, Hirano-ku, and Ikuno-ku | 445,958 | Tadashi Morishima | Nippon Ishin | |
| 3rd district | Osaka, wards of Nishinari-ku, Suminoe-ku, Sumiyosho-ku, and Taisho-ku | 365,973 | Shigeki Sato | Komeito | |
| 4th district | Osaka, wards of Fukushima-ku, Joto-ku, Kita-ku, and Miyakojima-ku | 410,669 | Teruo Minobe | Nippon Ishin | |
| 5th district | Osaka, wards of Higashiyodogawa-ku, Konohana-ku, Nishiyodogawa-ku, and Yodogawa-ku | 432,729 | Toru Kunishige | Komeito | |
| 6th district | Osaka, wards of Asahi-ku and Tsurumi-kuCities of Kadoma and Moriguchi | 390,026 | Shinichi Isa | Komeito | |
| 7th district | Cities of Settsu and Suita | 385,703 | Takemitsu Okushita | Nippon Ishin | |
| 8th district | Cities of Ikeda and Toyonaka | 423,902 | Joji Uruma | Nippon Ishin | |
| 9th district | Cities of Ibaraki and MinooDistrict of Toyono | 371,891 | Yasushi Adachi | Nippon Ishin | |
| 10th district | City of TakatsukiDistrict of Mishima | 320,615 | Taku Ikeshita | Nippon Ishin | |
| 11th district | Cities of Hirakata and Katano | 398,982 | Hiroshi Nakatsuka | Nippon Ishin | |
| 12th district | Cities of Daitō, Neyagawa, and Shijōnawate | 339,048 | Fumitake Fujita | Nippon Ishin | |
| 13th district | City of Higashiōsaka | 400,456 | Ryohei Iwatani | Nippon Ishin | |
| 14th district | Cities of Fujiidera, Habikino, Kashiwara, and Yao | 420,979 | Hitoshi Aoyagi | Nippon Ishin | |
| 15th district | Sakai, ward of Mihara-kuCities of Kawachinagano, Matsubara, Ōsakasayama, and TondabayashiDistrict of Minamikawachi | 388,103 | Yasuto Urano | Nippon Ishin | |
| 16th district | Sakai, wards of Higashi-ku, Kita-ku, and Sakai-ku | 326,786 | Kazuo Kitagawa | Komeito | |
| 17th district | Sakai, wards of Minami-ku, Naka-ku, and Nishi-ku | 329,205 | Nobuyuki Baba[31] | Nippon Ishin | |
| 18th district | Cities of Izumi, Izumiōtsu, Kishiwada, and TakaishiDistrict of Senboku | 433,984 | Takashi Endo | Nippon Ishin | |
| 19th district | Cities of Hannan, Izumisano, Kaizuka, and SennanDistrict of Sennan | 303,724 | Nobuhisa Ito | Nippon Ishin | |
| Cities of Ōtsu and Takashima | 325,422 | Toshitaka Ooka | LDP | ||
| 2nd district | Cities of Higashiōmi, Maibara, Nagahama, Hikone, and ŌmihachimanDistricts of Echi, Gamō, and Inukami | 437,139 | Kenichiro Ueno | LDP | |
| 3rd district | Cities of Kōka, Konan, Kusatsu, Moriyama, Rittō and Yasu | 392,383 | Nobuhide Takemura | LDP | |
| 1st district | City of Iwade, Kinokawa, and Wakayama | 403,217 | Yumi Hayashi | Nippon Ishin | |
| 2nd district | Cities of Arida, Gobō, Hashimoto, Kainan, Shingū, and TanabeDistricts of Arida, Hidaka, Higashimuro, Ito, Kaisō, and Nishimuro | 392,379 | Masatoshi Ishida | LDP | |
The block constituency for Chugoku (中国) elects 11 members proportionally. It corresponds to the Chugoku region.
| 1st district | Hiroshima, wards of Higashi-ku, Minami-ku, and Naka-kuDistrict of Aki (Towns of Fuchū, Kaita, and Saka) | 410,425 | |||
| 2nd district | Hiroshima, wards of Nishi-ku and Saeki-kuCities of Hatsukaichi, and Ōtake | 391,029 | Hiroshi Hiraguchi | LDP | |
| 3rd district | Hiroshima, wards of Aki-ku, Asakita-ku and Asaminami-kuCity of AkitakataDistrict of Yamagata | 423,244 | |||
| 4th district | Cities of Etajima, Higashihiroshima, Kure, and TakeharaDistricts of Toyota and Aki (Town of Kumano) | 398,489 | |||
| 5th district | Fuchū, Mihara, Miyoshi, Onomichi, and ShōbaraDistricts of Jinseki and Sera | 309,901 | Minoru Terada | LDP | |
| 6th district | City of Fukuyama | 381,074 | |||
| 1st district | Okayama, ward of Kita-kuCities of Akaiwa and BizenDistricts of Kaga and Wake | 329,469 | Ichiro Aisawa | LDP | |
| 2nd district | Okayama, ward of Higashi-ku, Minami-ku, and Naka-kuCities of Setouchi and Tamano | 417,620 | Takashi Yamashita | LDP | |
| 3rd district | Cities of Asakuchi, Ibara, Kasaoka, Mimasaka, Maniwa, Niimi, Sōja, Takahashi, and TsuyamaDistricts of Aida, Asakuchi, Katsuta, Kume, Maniwa, Oda, and Tomata | 410,597 | Shojiro Hiranuma | LDP | |
| 4th district | City of KurashikiDistrict of Tsukubo | 405,558 | Gaku Hashimoto | LDP | |
| 1st district | Cities of Matsue, Unnan, and YasugiDistricts of Iishi, Nita, and Oki | 259,179 | Hiroyuki Hosoda | Independent | |
| 2nd district | Cities Gōtsu, Hamada, Izumo, Masuda, and ŌdaDistricts of Kanoashi and Ōchi | 296,468 | Yasuhiro Takami | LDP | |
| 1st district | Cities of Kurayoshi and TottoriDistrict of Iwami, Yazu, and Tōhaku (Town of Misasa) | 229,371 | Shigeru Ishiba | LDP | |
| 2nd district | Cities of Sakaiminato and YonagoDistricts of Hino, Saihaku, and Tōhaku (Towns of Hokuei, Kotoura, and Yurihama) | 232,955 | Ryosei Akazawa | LDP | |
| 1st district | Cities of Hōfu, Ube, and Yamaguchi | 391,474 | Masahiko Kōmura | LDP | |
| 2nd district | Cities of Hikari, Iwakuni, Kudamatsu, Shūnan, and YanaiDistricts of Kuga, Kumage, and Ōshima | 386,937 | Nobuchiyo Kishi | LDP | |
| 3rd district | Cities of Hagi, Mine, Nagato, Sanyo-Onoda, and ShimonosekiDistrict of Abu | 355,510 | Yoshimasa Hayashi | LDP | |
The block constituency for Shikoku (比例四国ブロック) elects 6 members proportionally. It corresponds to the Shikoku region.
| District 1 | City of Matsuyama | 426,322 | Akihisa Shiozaki | LDP | |
| District 2 | Cities of Imabari, Niihama, Saijō, and ShikokuchūōDistrict of Ochi | 393,597 | Seiichiro Murakami | LDP | |
| District 3 | Cities Iyo, Ōzu, Seiyo, Uwajima, Tōon, and YawatahamaDistricts Iyo, Kamiukena, Kita, Kitauwa, Minamiuwa, and Nishiuwa | 314,289 | Takumi Ihara | LDP |
| 1st district | Part of the city of TakamatsuDistricts of Kagawa and Shozu | 312,992 | Junya Ogawa | CDP | |
| 2nd district | Cities of Higashikagawa, Sakaide, Sanuki and parts of Takamatsu and MarugameDistricts Kita and Ayauta | 256,773 | Yuichiro Tamaki | DPFP | |
| 3rd district | Cities Kan'onji, Mitoyo, Zentsuji, and part of MarugameDistrict of Nakatado | 238,016 | Keitaro Ohno | LDP | |
| 1st district | Cities of Aki, Kami, Kōnan, Muroto, Nankoku, and part of Kōchi | 308,938 | Gen Nakatani | LDP | |
| 2nd district | Cities of Shimanto, Susaki, Sukumo and Tosa, Tosashimizu, and part of Kōchi | 284,670 | Masanao Ozaki | LDP | |
| 1st district | Cities of: Tokushima, Komatsushima, and Anan. | 360,095 | Hirobumi Niki | YK | |
| 2nd district | Cities of: Awa, Yoshinogawa, Naruto, Mima, and Miyoshi. | 258,564 | Shunichi Yamaguchi | LDP | |
The block constituency for Kyūshū (九州) elects 21 members proportionally. It includes all the prefectures on Kyūshū island, as well as Okinawa Prefecture.
| 1st district | Fukuoka, wards of Hakata-ku and part of Higashi-ku | 431,653 | Takahiro Inoue | LDP | |
| 2nd district | Fukuoka, wards of Chūō-ku and part of Jonan-ku and Minami-ku | 453,775 | Makoto Oniki | LDP | |
| 3rd district | Fukuoka, wards of Nishi-ku, Sawara-ku, and part of Jonan-kuCity of Itoshima | 446,205 | Atsushi Koga | LDP | |
| 4th district | Fukuoka, part of the ward of Higashi-kuCities Fukutsu, Koga, and MunakataDistrict of Kasuya | 398,041 | Hideki Miyauchi | LDP | |
| 5th district | Fukuoka, part of the ward of Minami-kuCities of Asakura, Chikushino, Dazaifu, Kasuga, Nakagawa and OnojoDistrict of Asakura | 456,331 | Kaname Tsutsumi | CDP | |
| 6th district | Cities of Kurume, Ogori, Okawa, and UkihaDistricts of Mii and Mizuma | 373,877 | Jiro Hatoyama | LDP | |
| 7th district | Cities of Chikugo, Miyama, Omuta, Yame, and YanagawaDistrict of Yame | 286,562 | Satoshi Fujimaru | LDP | |
| 8th district | Cities of Iizuka, Kama, Miyawaka, Nakama, and NogataDistricts of Kaho, Kurate, and Onga | 347,369 | Tarō Asō | LDP | |
| 9th district | Kitakyushu, wards of Tobata-ku, Wakamatsu-ku, Yahatahigashi-ku, and Yahatanishi-ku | 378,490 | Rintaro Ogata | Komeito | |
| 10th district | Kitakyushu, wards of Kokurakita-ku, Kokuraminami-ku, and Moji-ku | 406,620 | Takashi Kii | CDP | |
| 11th district | Cities of Buzen, Tagawa, and YukuhashiDistricts of Chikujō, Miyako, and Tagawa | 255,347 | Ryota Takeda | LDP | |
| 1st district | Part of the city of KagoshimaDistrict of Kagoshima | 357,284 | Takuma Miyaji | LDP | |
| 2nd district | Cities of Amami, Ibusuki, Makurazaki, Minamisatsuma, Minamikyushu, and part of KagoshimaDistrict of Ōshima | 334,582 | Satoshi Mitazono | LDP | |
| 3rd district | Cities of Aira, Akune, Hioki, Ichikikushikino, Isa, Izumi, and SatsumasendaiDistricts of Aira, Izumi, and Satsuma | 316,469 | Takeshi Noma | CDP | |
| 4th district | Cities of Kanoya, Kirishima, Nishinoomote, Shibushi, Soo, and TarumizuDistrict of Kimotsuki, Kumage, and Soo | 323,373 | Hiroshi Moriyama | LDP | |
| 1st district | Kumamoto, wards of Chuo, Higashi, and Kita | 422,072 | Minoru Kihara | LDP | |
| 2nd district | Kumamoto, wards of Nishi and MinamiCities of Arao and TamanaDistrict of Tamana | 313,172 | Daisuke Nishino | LDP | |
| 3rd district | Cities of Kochi, Aso, Kikuchi, and YamagaDistricts of Aso, Kamimashiki, and Kikuchi | 315,454 | Tetsushi Sakamoto | LDP | |
| 4th district | Cities of Amakusa, Hitoyoshi, Kami-Amakusa, Minamata, Uki, Uto, and YatsushiroDistricts of Ashikita, Amakusa, Kuma, Shimomashiki, and Yatsushiro | 399,867 | Yasushi Kaneko | LDP | |
| Miyazaki 1st | City of MiyazakiDistrict of Higashimorokata | 354,398 | So Watanabe | CDP | |
| Miyazaki 2nd | Cities of Hyuga, Nobeoka, and SaitoDistricts of Higashiusuki, Koyu, and Nishiusuki | 270,284 | Taku Etō | LDP | |
| Miyazaki 3rd | Cities of Ebino, Kobayashi, Kushima, Miyakonojo, and NichinanDistricts of Kitamorokata and Nishimorokata | 271,813 | Yoshihisa Furukawa | LDP | |
| 1st district | City of Nagasaki | 344,579 | Hideko Nishioka | DPFP | |
| 2nd district | Cities of Iki, Isahaya, Minamishimabara, Omura, Shimabara, Unzen, and TsushimaDistrict of Nishisonogi | 403,812 | Ryusho Kato | LDP | |
| 3rd district | Cities of Gotō, Hirado, Matsuura, Saikai, and SaseboDistricts of Higashisonogi, Kitamatsuura, and Minamimatsura | 357,963 | Yaichi Tanigawa | LDP | |
| 1st district | Part of the city of Ōita | 386,368 | Shuji Kira | YK | |
| 2nd district | Cities of Bungo-ōno, Hita, Saiki, Taketa, Tsukumi, Yufu, Usuki, and part of Ōita District of Kusu | 264,423 | Seishirō Etō | LDP | |
| 3rd district | Cities of Beppu, Bungotakada, Kitsuki, Nakatsu, Kunisaki, and Usa Districts of Hayami, and Higashikunisaki | 299,659 | Takeshi Iwaya | LDP | |
| City of Naha District of Shimajiri (Town of Kumejima and villages of Aguni, Kitadaitō, Minamidaitō, Tokashiki, Tonaki, and Zamami) | 268,018 | Seiken Akamine | Communist | ||
| Cities of Ginowan and Urasoe District of Nakagami | 296,016 | Kunio Arakaki | CDP | ||
| Cities of Nago, Okinawa, Uruma Districts of Kunigami and Shimajiri (Villages of Iheya and Izena) | 318,484 | Aiko Shimajiri | LDP | ||
| 4th district | Cities of Miyakojima, Ishigaki, Itoman, Tomigusuku and Nanjō. Districts of: Miyako, Yaeyama, Shimajiri (Towns of Haebaru, Yaese, and Yonabaru) | 296,996 | Kōsaburō Nishime | LDP | |
| 1st district | Cities of Kanzaki, Saga, and Tosu | 333,869 | Kazuhiro Haraguchi | CDP | |
| 2nd district | Cities of Kashima, Ogi, Imari, Karatsu, Ureshino, Takeo, and Taku. Districts of Fujitsu, Kishima, Higashimatsuura, and Nishimatsuura. | 338,720 | Hiroshi Ogushi | CDP | |