The was a constituency that represents Kōchi Prefecture in the House of Councillors in the Diet of Japan. Councillors are elected to the house by single non-transferable vote (SNTV) for six-year terms. Since the establishment of the current House of Councillors electoral system in 1947, the district has elected two Councillors, one each at elections held every three years. With its 618,834 registered voters (as of September 2015)[1] it is the third-smallest electoral district for the house. To address the imbalance in representation between districts, a 2015 revision of the Public Officers Election Law will see the district merged with the Tokushima At-large district to create the Tokushima-Kochi At-large district;[2] this change will begin to take effect at the 2016 election, at which one Councillor will be elected.
The Councillors currently representing Kochi are:
| class of 1947 | election year | class of 1950 |
|---|---|---|
| (1947: 6-year term) | (1947: 3-year term) | |
| Kameshichi Nishiyama (Liberal) | 1947 | Tazō Irimajiri (Democratic) |
| 1950 | Tazō Irimajiri (Liberal) | |
| Yutaka Terao (Liberal) | 1953 | |
| 1956 | Akira Sakamoto (Social Democratic) | |
| Yutaka Terao (LDP) | 1959 | |
| 1962 | Shunji Shiomi (LDP) | |
| 1965 | ||
| 1968 | ||
| Takao Hamada (LDP)[3] | 1971 | |
| Yu Hayashi (LDP) | 1974 by-election | |
| 1974 | ||
| 1977 | ||
| 1980 | Kanzo Tanigawa (LDP) | |
| 1983 | ||
| 1986 | ||
| Ruriko Nishioka (Social Democratic) | 1989 | |
| 1992 | Sadao Hirano (Ind.) | |
| Kohei Tamura (Ind.) | 1995 | |
| 1998 | Hiroyuki Morishita (LDP) | |
| 2001 | ||
| 2004[4] | Hajime Hirota (Ind.)[5] | |
| Norio Takeuchi (DPJ) | 2007[6] | |
| 2010[7] | Hajime Hirota (DPJ) | |
| Kojiro Takano (LDP) | 2013[8] | |
| 2016 | Seat abolished | |
| Seat abolished | 2019 |