| Iaaf: | JPN |
| Fedname: | Japan Association of Athletics Federations |
| Year: | 2011 |
| Games: | World Championships in Athletics |
| Location: | Daegu |
| Competitors: | 48 |
| Gold: | 1 |
| Silver: | 0 |
| Bronze: | 0 |
| Previous: | 2009 |
| Next: | 2013 |
Japan competed at the 2011 World Championships in Athletics from August 27 to September 4 in Daegu, South Korea.
The country will send a 50-member squad to compete at the event. The final team composition was announced following the conclusion of the Asian Championships in Kobe, Japan, the final qualifying meeting as designated by the Japan Association of Athletics Federations.
The final team on the entry list comprises the names of 52 athletes, including 2 athletes invited by the IPC for exhibitionevents: Jun Hiromichi, 400m T53 (wheelchair) men, and Wakako Tsuchida, 800m T54 (wheelchair) women.
The following athletes appeared on the preliminary Entry List, but not on the Official Start List of the specific event, resulting in a total number of 48 competitors:
| Event | Athlete | |
|---|---|---|
| Men | 4 × 100 metres relay | Sota Kawatsura |
| Kei Takase | ||
| 4 × 400 metres relay | Takatoshi Abe | |
| Yuta Imazeki | ||
| Women | 4 × 100 metres relay | Kana Ichikawa |
| Satomi Kubokura |
The following competitor from Japan won a medal at the Championships | width="78%" align="left" valign="top" |
| Athlete | Event | Preliminaries | Heats | Semifinals | Final | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| Time Width Height | Rank | Time Width Height | Rank | Time Width Height | Rank | Time Width Height | Rank | |||
| Shinji Takahira | 200 metres | 20.87 | align=center style="border-right:double" | 26 | 20.90 | align=center style="border-right:double" | 16 | Did not advance | ||
| Hitoshi Saito | 200 metres | 20.80 | align=center style="border-right:double" | 21 | 21.17 | align=center style="border-right:double" | 19 | Did not advance | ||
| Yuichi Kobayashi | 200 metres | 21.27 | align=center style="border-right:double" | 46 | Did not advance | |||||
| Yuzo Kanemaru | 400 metres | 45.51 | align=center style="border-right:double" | 19 | 46.11 | align=center style="border-right:double" | 20 | Did not advance | ||
| Masato Yokota | 800 metres | 1:47.60 | align=center style="border-right:double" | 26 | Did not advance | |||||
| Kazuya Watanabe | 5000 metres | 14:20.64 | align=center style="border-right:double" | 33 | Did not advance | |||||
| Yuki Sato | 10,000 metres | 29:04.15 | 15 | |||||||
| Hiroyuki Horibata | Marathon | 2:11:52 | 7 | |||||||
| Kentaro Nakamoto | Marathon | 2:13:10 | 10 | |||||||
| Yuki Kawauchi | Marathon | 2:16:11 | 18 | |||||||
| Yoshinori Oda | Marathon | 2:18:05 | 29 | |||||||
| Yukihiro Kitaoka | Marathon | 2:23:11 SB | 38 | |||||||
| Takayuki Kishimoto | 400 m hurdles | 49.51 | align=center style="border-right:double" | 17 | 50.05 | align=center style="border-right:double" | 20 | Did not advance | ||
| Yuta Imazeki | 400 m hurdles | 50.92 | align=center style="border-right:double" | 30 | Did not advance | |||||
| Takatoshi Abe | 400 m hurdles | 51.90 | align=center style="border-right:double" | 33 | Did not advance | |||||
| Yuichi Kobayashi Masashi Eriguchi Shinji Takahira Hitoshi Saito | 4 × 100 metres relay | 38.66 SB | align=center style="border-right:double" | 9 | Did not advance | |||||
| Kei Takase Yuzo Kanemaru Yusuke Ishitsuka Hideyuki Hirose | 4 × 400 metres relay | 3:02.64 SB | align=center style="border-right:double" | 13 | Did not advance | |||||
| Yusuke Suzuki | 20 kilometres walk | 1:21:39 | 8 | |||||||
| Koichiro Morioka | 50 kilometres walk | 3:46:21 | 6 | |||||||
| Takayuki Tanii | 50 kilometres walk | 3:48:03 SB | 9 | |||||||
| Hirooki Arai | 50 kilometres walk | 3:48:40 PB | 10 | |||||||
| Daichi Sawano | Pole vault | 5.50 | align=center style="border-right:double" | 12 q | 5.65 SB | 14 | ||||
| Koji Murofushi | Hammer throw | 78.56 SB | align=center style="border-right:double" | 1 | 81.24 SB | |||||
| Yukifumi Murakami | Javelin throw | 80.19 | align=center style="border-right:double" | 15 | Did not advance | |||||
Decathlon
| Keisuke Ushiro | |||||
|---|---|---|---|---|---|
| Event | Results | Points | Rank | ||
| 100 m | 11.42 | 769 | 30 | ||
| Long jump | 6.96 | 804 | 23 | ||
| Shot put | 12.88 | 660 | 27 | ||
| High jump | 2.02 | 822 | 12 | ||
| 400 m | 50.89 | 774 | 22 | ||
| 110 m hurdles | 15.20 | 825 | 26 | ||
| Discus throw | 43.84 | 743 | 15 | ||
| Pole vault | 4.40 | 731 | 21 | ||
| Javelin throw | 67.73 | 855 | 4 | ||
| 1500 m | 4:43.87 | 656 | 13 | ||
| Total | 7639 | 20 | |||
| Athlete | Event | Preliminaries | Heats | Semifinals | Final | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| Time Width Height | Rank | Time Width Height | Rank | Time Width Height | Rank | Time Width Height | Rank | |||
| Chisato Fukushima | 100 metres | 11.34 | align=center style="border-right:double" | 22 Q | 11.59 | align=center style="border-right:double" | 22 | Did not advance | ||
| Chisato Fukushima | 200 metres | 23.25 | align=center style="border-right:double" | 23 | 23.52 | align=center style="border-right:double" | 20 | Did not advance | ||
| Hitomi Niiya | 5000 metres | 15:31.09 | align=center style="border-right:double" | 7 | 15:41.67 | 13 | ||||
| Megumi Kinukawa | 5000 metres | 15:38.23 | align=center style="border-right:double" | 16 | Did not advance | |||||
| Kayo Sugihara | 5000 metres | 15:41.78 SB | align=center style="border-right:double" | 18 | Did not advance | |||||
| Hikari Yoshimoto | 10,000 metres | 32:32.22 | 14 | |||||||
| Kayo Sugihara | 10,000 metres | 32:53.89 | 15 | |||||||
| Megumi Kinukawa | 10,000 metres | 34:08.37 [1] | 17 | |||||||
| Yukiko Akaba | Marathon | 2:29:35 | 5 | |||||||
| Remi Nakazato | Marathon | 2:30:52 | 10 | |||||||
| Yoshimi Ozaki | Marathon | 2:32:31 | 18 | |||||||
| Azusa Nojiri | Marathon | 2:33:42 | 19 | |||||||
| Mai Ito | Marathon | 2:35:16 | 22 | |||||||
| Satomi Kubokura | 400 m hurdles | 56.66 | align=center style="border-right:double" | 24 | 56.87 | align=center style="border-right:double" | 21 | Did not advance | ||
| Minori Hayakari | 3000 metres steeplechase | 10:05.34 | align=center style="border-right:double" | 27 | align=center colspan= 2 | Did not advance | ||||
| Nao Okabe Momoko Takahashi Chisato Fukushima Saori Imai | 4 × 100 metres relay | 43.83 | align=center style="border-right:double" | 12 | Did not advance | |||||
| Kumi Otoshi | 20 kilometres walk | 1:34:37 | 20 | |||||||
| Mayumi Kawasaki | 20 kilometres walk | 1:35:03 | 22 | |||||||
| Masumi Fuchise | 20 kilometres walk | DNF | ||||||||
| Masumi Aya | Hammer throw | 64.09 | align=center style="border-right:double" | 27 | Did not advance | |||||
| Yuki Ebihara | Javelin throw | 59.88 | align=center style="border-right:double" | 10 | 59.08 | 9 | ||||
| Risa Miyashita | Javelin throw | 55.62 | align=center style="border-right:double" | 26 | Did not advance | |||||