Participation of Japan at IMO
Japan has participated 23 times at the IMO and its team members gained 32 gold, 61 silver and 34 bronze medals.
| IMO90 Ranking: 20/54 | ||||||||||
| JPN | Atsuo Yamauchi | 7 | 7 | 3 | 7 | 1 | 0 | 25 | Silver Medal | |
| JPN | Atsushi Kitaueda | 1 | 0 | 2 | 1 | 5 | 0 | 9 | ||
| JPN | Kenichi Kono | 4 | 1 | 1 | 2 | 1 | 1 | 10 | ||
| JPN | Osamu Iyama | 0 | 7 | 0 | 7 | 7 | 1 | 22 | Bronze Medal | |
| JPN | Tomoyuki Katsumata | 4 | 3 | 1 | 0 | 5 | 1 | 14 | ||
| JPN | Yosuke Suma | 4 | 7 | 2 | 0 | 7 | 7 | 27 | Silver Medal | |
| Total: | 6 members | 20 | 25 | 9 | 17 | 26 | 10 | 107 | G:0, S:2, B:1 | |
| IMO91 Ranking: 12/55 | ||||||||||
| JPN1 | Tatsuyuki Iwata | 7 | 7 | 7 | 7 | 0 | 1 | 29 | Bronze Medal | |
| JPN2 | Taku Katagiri | 7 | 7 | 4 | 7 | 7 | 3 | 35 | Silver Medal | |
| JPN3 | Hiroki Kodama | 6 | 3 | 3 | 6 | 6 | 7 | 31 | Silver Medal | |
| JPN4 | Hiroki Tamura | 6 | 7 | 3 | 1 | 7 | 2 | 26 | Bronze Medal | |
| JPN5 | Junichirou Nakashima | 7 | 4 | 4 | 0 | 6 | 0 | 21 | Bronze Medal | |
| JPN6 | Atsuo Yamauchi | 7 | 7 | 7 | 3 | 7 | 7 | 38 | Silver Medal | |
| Total: | 6 members | 40 | 35 | 28 | 24 | 33 | 20 | 180 | G:0, S:3, B:3 | |
| IMO92 Ranking: 8/64 | ||||||||||
| JPN1 | Tatsuyuki Iwata | 5 | 3 | 7 | 7 | 3 | 4 | 29 | Silver Medal | |
| JPN2 | Hiroki Kodama | 7 | 7 | 7 | 7 | 0 | 7 | 35 | Gold Medal | |
| JPN3 | Sanefumi Moriyama | 1 | 3 | 0 | 7 | 0 | 3 | 14 | Bronze Medal | |
| JPN4 | Yasuyuki Shirano | 0 | 1 | 0 | 7 | 0 | 0 | 8 | H. mention | |
| JPN5 | Hiroki Tamura | 7 | 7 | 7 | 1 | 1 | 7 | 30 | Silver Medal | |
| JPN6 | Atsuo Yamauchi | 7 | 7 | 3 | 4 | 0 | 5 | 26 | Silver Medal | |
| Total: | 6 members | 27 | 28 | 24 | 33 | 4 | 26 | 142 | G:1, S:3, B:1 | |
| IMO93 Ranking: 20/73 | ||||||||||
| JPN1 | Kokoro Ikeda | 7 | 0 | 0 | 2 | 2 | 2 | 13 | Bronze Medal | |
| JPN2 | Takashi Itou | 0 | 0 | 7 | 0 | 7 | 2 | 16 | Bronze Medal | |
| JPN3 | Masahiko Shinozaki | 1 | 0 | 0 | 0 | 6 | 2 | 9 | ||
| JPN4 | Tsukasa Shibue | 0 | 4 | 0 | 7 | 4 | 5 | 20 | Silver Medal | |
| JPN5 | Satoru Takashi | 7 | 0 | 7 | 3 | 4 | 5 | 26 | Silver Medal | |
| JPN6 | Teruyoshi Yoshida | 0 | 0 | 0 | 6 | 4 | 4 | 14 | Bronze Medal | |
| Total: | 6 members | 15 | 4 | 14 | 18 | 27 | 20 | 98 | G:0, S:2, B:3 | |
| IMO94 Ranking: 10/69 | ||||||||||
| JPN | Satoru Takahashi | 7 | 7 | 7 | 7 | 6 | 7 | 41 | Gold Medal | |
| JPN | Tetsuyuki Maruoka | 7 | 7 | 7 | 7 | 5 | 0 | 33 | Silver Medal | |
| JPN | Masashi Okinawa | 5 | 7 | 7 | 7 | 6 | 0 | 32 | Silver Medal | |
| JPN | Takashi Itou | 2 | 7 | 7 | 4 | 0 | 7 | 27 | Bronze Medal | |
| JPN | Naotoshi Nakamura | 0 | 7 | 7 | 7 | 5 | 1 | 27 | Bronze Medal | |
| JPN | Toshiyuki Shimono | 0 | 7 | 7 | 2 | 4 | 0 | 20 | Bronze Medal | |
| Total: | 6 members | 21 | 42 | 42 | 34 | 26 | 15 | 180 | G:1, S:2, B:3 | |
| IMO95 Ranking: 9/73 | ||||||||||
| JPN1 | Ryoji Hiraguchi | 7 | 7 | 4 | 7 | 7 | 0 | 32 | Silver Medal | |
| JPN2 | Tetsuyuki Maruoka | 7 | 7 | 7 | 6 | 7 | 7 | 41 | Gold Medal | |
| JPN3 | Yuichiro Yoshizawa | 7 | 0 | 0 | 7 | 7 | 0 | 21 | Bronze Medal | |
| JPN4 | Yuji Tachikawa | 7 | 0 | 7 | 7 | 7 | 3 | 31 | Silver Medal | |
| JPN5 | Satoru Takahashi | 7 | 0 | 7 | 7 | 7 | 7 | 35 | Silver Medal | |
| JPN6 | Katsuki Tezuka | 7 | 0 | 0 | 7 | 7 | 2 | 23 | Bronze Medal | |
| Total: | 6 members | 42 | 14 | 25 | 41 | 42 | 19 | 183 | G:1, S:3, B:2 | |
| IMO96 Ranking: 11/75 | ||||||||||
| JPN1 | Tetsuyuki Maruoka | 7 | 7 | 6 | 7 | 0 | 0 | 27 | Silver Medal | |
| JPN2 | Sachiko Nakajima | 7 | 7 | 7 | 7 | 1 | 7 | 36 | Gold Medal | |
| JPN3 | Tomoshi Otsuki | 6 | 0 | 1 | 1 | 0 | 0 | 8 | ||
| JPN4 | Yuji Tachikawa | 2 | 1 | 7 | 7 | 0 | 7 | 24 | Silver Medal | |
| JPN5 | Masaki Tezuka | 7 | 0 | 2 | 3 | 0 | 7 | 19 | Bronze Medal | |
| JPN6 | Shin-ichi Tsutsumi | 7 | 0 | 1 | 7 | 0 | 7 | 22 | Silver Medal | |
| Total: | 6 members | 36 | 15 | 24 | 32 | 1 | 28 | 136 | G:1, S:3, B:1 | |
| IMO97 Ranking: 12/82 | ||||||||||
| JPN1 | Ryo Ishida | 4 | 7 | 7 | 7 | 0 | 0 | 25 | Silver Medal | |
| JPN2 | Tetsuyuki Maruoka | 7 | 7 | 7 | 7 | 7 | 5 | 40 | Gold Medal | |
| JPN3 | Yoichi Mieda | 7 | 1 | 0 | 0 | 0 | 3 | 11 | H. mention | |
| JPN4 | Kentaro Nagao | 2 | 7 | 7 | 7 | 7 | 0 | 30 | Silver Medal | |
| JPN5 | Sachiko Nakajima | 7 | 7 | 0 | 7 | 5 | 7 | 33 | Silver Medal | |
| JPN6 | Takashi Okajima | 4 | 7 | 3 | 3 | 7 | 0 | 24 | Bronze Medal | |
| Total: | 6 members | 31 | 36 | 24 | 31 | 26 | 15 | 163 | G:1, S:3, B:1 | |
| IMO98 Ranking: 14/76 | ||||||||||
| JPN1 | Ryo Ishida | 2 | 7 | 3 | 2 | 7 | 0 | 21 | Bronze Medal | |
| JPN2 | Kentaro Nagao | 7 | 7 | 3 | 7 | 7 | 6 | 37 | Gold Medal | |
| JPN3 | Takashi Okajima | 2 | 7 | 2 | 7 | 2 | 0 | 20 | Bronze Medal | |
| JPN4 | Nariaki Okawara | 7 | 7 | 0 | 7 | 0 | 0 | 21 | Bronze Medal | |
| JPN5 | Masao Oi | 0 | 7 | 0 | 6 | 0 | 0 | 13 | H. mention | |
| JPN6 | Sohei Tomizawa | 7 | 7 | 7 | 6 | 0 | 0 | 27 | Silver Medal | |
| Total: | 6 members | 25 | 42 | 15 | 35 | 16 | 6 | 139 | G:1, S:1, B:3 | |
| IMO99 Ranking: 13/81 | ||||||||||
| JPN1 | Naoki Imai | 5 | 1 | 4 | 4 | 5 | 0 | 19 | Silver Medal | |
| JPN2 | Atsushi Ito | 6 | 3 | 4 | 7 | 7 | 3 | 30 | Gold Medal | |
| JPN3 | Akitoshi Kawamura | 7 | 1 | 6 | 2 | 2 | 1 | 19 | Silver Medal | |
| JPN4 | Kentaro Nagao | 7 | 7 | 7 | 4 | 0 | 3 | 28 | Gold Medal | |
| JPN5 | Yoshiki Oshima | 5 | 1 | 4 | 3 | 0 | 6 | 19 | Silver Medal | |
| JPN6 | Shingo Saito | 7 | 2 | 1 | 2 | 7 | 1 | 20 | Silver Medal | |
| Total: | 6 members | 37 | 15 | 26 | 22 | 21 | 14 | 135 | G:2, S:4, B:0 | |
| IMO00 Ranking: 15/82 | ||||||||||
| JPN1 | Naoki Imai | 7 | 1 | 1 | 0 | 6 | 7 | 22 | Silver Medal | |
| JPN2 | Yoshiki Oshima | 7 | 1 | 1 | 7 | 7 | 0 | 23 | Silver Medal | |
| JPN3 | Hiroki Kondo | 2 | 7 | 0 | 7 | 3 | 0 | 19 | Bronze Medal | |
| JPN4 | Yusuke Kobayashi | 3 | 1 | 6 | 6 | 1 | 0 | 17 | Bronze Medal | |
| JPN5 | Kentaro Nagao | 7 | 1 | 3 | 6 | 7 | 7 | 31 | Gold Medal | |
| JPN6 | Takayoshi Yamamoto | 7 | 0 | 0 | 6 | 0 | 0 | 13 | Bronze Medal | |
| Total: | 6 members | 33 | 11 | 11 | 32 | 24 | 14 | 125 | G:1, S:2, B:3 | |
| IMO01 Ranking: 13/83 | ||||||||||
| JPN1 | Naoki Imai | 7 | 4 | 1 | 7 | 3 | 2 | 24 | Silver Medal | |
| JPN2 | Hideaki Jo | 7 | 0 | 1 | 4 | 7 | 0 | 19 | Bronze Medal | |
| JPN3 | Hiroki Kondo | 7 | 0 | 0 | 1 | 7 | 0 | 15 | Bronze Medal | |
| JPN4 | Yuji Odaka | 7 | 5 | 2 | 7 | 5 | 4 | 30 | Gold Medal | |
| JPN5 | Yoshiki Oshima | 7 | 4 | 1 | 7 | 4 | 0 | 23 | Silver Medal | |
| JPN6 | Takayoshi Yamamoto | 7 | 5 | 2 | 7 | 2 | 0 | 23 | Silver Medal | |
| Total: | 6 members | 42 | 18 | 7 | 33 | 28 | 6 | 134 | G:1, S:3, B:2 | |
| IMO02 Ranking: 16/84 | ||||||||||
| JPN1 | Naoki Imai | 7 | 6 | 6 | 7 | 3 | 0 | 29 | Gold Medal | |
| JPN2 | Hiroki Kondo | 7 | 6 | 1 | 7 | 6 | 0 | 27 | Silver Medal | |
| JPN3 | Masaki Nishimoto | 6 | 1 | 1 | 0 | 2 | 1 | 11 | ||
| JPN4 | Yuji Odaka | 6 | 6 | 1 | 4 | 7 | 0 | 24 | Silver Medal | |
| JPN5 | Yoshiki Oshima | 7 | 1 | 1 | 7 | 7 | 2 | 25 | Silver Medal | |
| JPN6 | Tomoyuki Yokota | 7 | 1 | 1 | 6 | 2 | 0 | 17 | Bronze Medal | |
| Total: | 6 members | 40 | 21 | 11 | 31 | 27 | 3 | 133 | G:1, S:3, B:1 | |
| IMO03 Ranking: 9/82 | ||||||||||
| JPN1 | Jun Adachi | 6 | 3 | 0 | 5 | 0 | 0 | 14 | Bronze Medal | |
| JPN2 | Kei Irie | 5 | 2 | 0 | 7 | 1 | 7 | 22 | Silver Medal | |
| JPN3 | Tomohiro Nagasaka | 7 | 1 | 0 | 7 | 1 | 1 | 17 | Bronze Medal | |
| JPN4 | Masaki Nishimoto | 7 | 7 | 0 | 7 | 7 | 1 | 29 | Gold Medal | |
| JPN5 | Yuji Odaka | 7 | 2 | 0 | 7 | 4 | 1 | 21 | Silver Medal | |
| JPN6 | Yoshiki Oshima | 7 | 7 | 0 | 7 | 7 | 0 | 28 | Silver Medal | |
| Total: | 6 members | 39 | 22 | 0 | 40 | 20 | 10 | 131 | G:1, S:3, B:2 | |
| IMO04 Ranking: 8/85 | ||||||||||
| JPN1 | Kei Irie | 7 | 7 | 2 | 7 | 5 | 2 | 30 | Silver Medal | |
| JPN2 | Toshiki Kataoka | 7 | 2 | 4 | 7 | 7 | 1 | 28 | Silver Medal | |
| JPN3 | Tsukasa Kuribayashi | 7 | 7 | 2 | 7 | 3 | 1 | 27 | Silver Medal | |
| JPN4 | Yuya Matsumoto | 6 | 7 | 2 | 7 | 1 | 7 | 30 | Silver Medal | |
| JPN5 | Masaki Nishimoto | 6 | 7 | 3 | 7 | 3 | 7 | 33 | Gold Medal | |
| JPN6 | Toshihiro Shimizu | 7 | 7 | 3 | 7 | 3 | 7 | 34 | Gold Medal | |
| Total: | 6 members | 40 | 37 | 16 | 42 | 22 | 25 | 182 | G:2, S:4, B:0 | |
| IMO05 Ranking: 8/91 | ||||||||||
| JPN1 | Toshiki Kataoka | 7 | 7 | 7 | 7 | 7 | 7 | 42 | Gold Medal | |
| JPN2 | Tsukasa Kuribayashi | 7 | 7 | 7 | 7 | 7 | 7 | 42 | Gold Medal | |
| JPN3 | Akinori Mitani | 7 | 7 | 0 | 7 | 0 | 7 | 28 | Silver Medal | |
| JPN4 | Yusuke Nakamura | 1 | 7 | 0 | 7 | 2 | 4 | 21 | Bronze Medal | |
| JPN5 | Makoto Soejima | 0 | 7 | 0 | 7 | 0 | 4 | 18 | Bronze Medal | |
| JPN6 | Masaki Watanabe | 7 | 7 | 2 | 7 | 7 | 7 | 37 | Gold Medal | |
| Total: | 6 members | 29 | 42 | 16 | 42 | 23 | 36 | 188 | G:3, S:1, B:2 | |
| IMO06 Ranking: 7/90 | ||||||||||
| JPN1 | Yuki Ito | 7 | 7 | 0 | 7 | 1 | 0 | 22 | Silver Medal | |
| JPN2 | Toshiki Kataoka | 7 | 7 | 2 | 7 | 1 | 2 | 26 | Silver Medal | |
| JPN3 | Teruhisa Koshikawa | 5 | 0 | 3 | 7 | 1 | 0 | 16 | Bronze Medal | |
| JPN4 | Yuta Ohashi | 7 | 7 | 7 | 7 | 3 | 0 | 31 | Gold Medal | |
| JPN5 | Masaki Watanabe | 7 | 7 | 0 | 7 | 7 | 1 | 29 | Gold Medal | |
| JPN6 | Yuki Yoshida | 7 | 7 | 1 | 7 | 0 | 0 | 22 | Silver Medal | |
| Total: | 6 members | 40 | 35 | 13 | 42 | 13 | 3 | 146 | G:2, S:3, B:1 | |
| IMO07 Ranking: 6/94 | ||||||||||
| JPN1 | Takuya Inoue | 7 | 7 | 0 | 7 | 1 | 0 | 22 | Silver Medal | |
| JPN2 | Toshiki Kataoka | 7 | 7 | 3 | 7 | 7 | 1 | 32 | Gold Medal | |
| JPN3 | Norifumi Seki | 7 | 7 | 0 | 7 | 5 | 0 | 26 | Silver Medal | |
| JPN4 | Makoto Soejima | 7 | 7 | 1 | 7 | 7 | 1 | 30 | Gold Medal | |
| JPN5 | Motoki Takigiku | 7 | 7 | 0 | 7 | 1 | 0 | 22 | Silver Medal | |
| JPN6 | Yuki Yoshida | 7 | 7 | 0 | 7 | 1 | 0 | 22 | Silver Medal | |
| Total: | 6 members | 42 | 42 | 4 | 42 | 22 | 2 | 154 | G:2, S:4, B:0 | |
| IMO08 Ranking: 11/97 | ||||||||||
| JPN1 | Tomohiro Asano | 7 | 1 | 0 | 7 | 7 | 0 | 22 | Silver Medal | |
| JPN2 | Kazuhiro Hosaka | 7 | 5 | 0 | 7 | 7 | 0 | 26 | Silver Medal | |
| JPN3 | Shiro Imamura | 5 | 1 | 7 | 6 | 7 | 1 | 27 | Silver Medal | |
| JPN4 | Norifumi Seki | 7 | 7 | 4 | 7 | 7 | 0 | 32 | Gold Medal | |
| JPN5 | Makoto Soejima | 7 | 7 | 7 | 7 | 7 | 0 | 35 | Gold Medal | |
| JPN6 | Motoki Takigiku | 7 | 7 | 0 | 7 | 0 | 0 | 21 | Bronze Medal | |
| Total: | 6 members | 40 | 28 | 18 | 41 | 35 | 1 | 163 | G:2, S:3, B:1 | |
| IMO09 Ranking: 2/104 | ||||||||||
| JPN | Kazuhiro Hosaka | 7 | 7 | 7 | 7 | 7 | 3 | 38 | Gold Medal | |
| JPN | Shiro Imamura | 7 | 7 | 7 | 6 | 7 | 0 | 34 | Gold Medal | |
| JPN | Suguru Ishikawa | 7 | 7 | 1 | 1 | 7 | 0 | 23 | Bronze Medal | |
| JPN | Akio Kishikawa | 7 | 7 | 7 | 7 | 7 | 4 | 39 | Gold Medal | |
| JPN | Makoto Soejima | 7 | 7 | 7 | 7 | 7 | 7 | 42 | Gold Medal | |
| JPN | Motoki Takigiku | 7 | 7 | 5 | 5 | 7 | 5 | 36 | Gold Medal | |
| Total: | 6 members | 42 | 42 | 34 | 33 | 42 | 19 | 212 | G:5, S:0, B:1 | |
| IMO10 Ranking: 7/96 | ||||||||||
| JPN | Shutaro Inoue | 7 | 7 | 7 | 7 | 0 | 0 | 28 | Gold Medal | |
| JPN | Akio Kishikawa | 7 | 7 | 7 | 7 | 6 | 0 | 34 | Gold Medal | |
| JPN | Takuma Kitamura | 7 | 7 | 1 | 7 | 0 | 0 | 22 | Silver Medal | |
| JPN | Hiroki Koshiyama | 7 | 7 | 0 | 7 | 0 | 1 | 22 | Silver Medal | |
| JPN | Naoto Kura | 7 | 0 | 0 | 7 | 0 | 0 | 14 | H. mention | |
| JPN | Genki Simizu | 6 | 1 | 0 | 7 | 0 | 7 | 21 | Silver Medal | |
| Total: | 6 members | 41 | 29 | 15 | 42 | 6 | 8 | 141 | G:2, S:3, B:0 | |
| IMO11 Ranking: 12/101 | ||||||||||
| JPN1 | Takuma Kitamura | 7 | 4 | 1 | 7 | 7 | 3 | 29 | Gold Medal | |
| JPN2 | Hiroki Koshiyama | 7 | 2 | 0 | 6 | 7 | 0 | 22 | Silver Medal | |
| JPN3 | Ryu Minegishi | 7 | 1 | 0 | 7 | 7 | 1 | 23 | Silver Medal | |
| JPN4 | Shogo Murai | 7 | 1 | 0 | 7 | 2 | 0 | 17 | Bronze Medal | |
| JPN5 | Genki Simizu | 7 | 1 | 0 | 7 | 6 | 0 | 21 | Bronze Medal | |
| JPN6 | Kensuke Yoshida | 7 | 6 | 7 | 7 | 7 | 1 | 35 | Gold Medal | |
| Total: | 6 members | 42 | 15 | 8 | 41 | 36 | 5 | 147 | G:2, S:2, B:2 | |
| IMO12 Ranking: 17/100 | ||||||||||
| JPN | Koyo Hayashi | 7 | 0 | 0 | 3 | 2 | 0 | 12 | H. mention | |
| JPN | Takuma Kitamura | 7 | 7 | 0 | 2 | 7 | 1 | 24 | Silver Medal | |
| JPN | Hiroki Komatsu | 7 | 6 | 0 | 7 | 5 | 0 | 25 | Silver Medal | |
| JPN | Daisuke Miyamoto | 7 | 1 | 2 | 5 | 0 | 0 | 15 | Bronze Medal | |
| JPN | Shogo Murai | 7 | 1 | 1 | 3 | 7 | 4 | 23 | Silver Medal | |
| JPN | Kento Nomura | 7 | 0 | 1 | 7 | 7 | 0 | 22 | Silver Medal | |
| Total: | 6 members | 42 | 15 | 4 | 27 | 28 | 5 | 121 | G:0, S:4, B:1 | |
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