| Sex | Athlete | DOB | Discipline | Round | POS | Mark |
|---|---|---|---|---|---|---|
| M | Tomohiro SHINNO | 17/08/1996 | High Jump | Qualification | 5 | 2.28 |
| M | Ryoichi AKAMATSU | 02/05/1995 | High Jump | Qualification | 11 | 2.21 |
| X | Japan | 4x400 Metres Relay | Heats | 8 | 3:17.31 | |
| W | Nanako FUJII | 07/05/1999 | 20 Kilometres Race Walk | Final | 6 | 1:29:01 |
| W | Kumiko OKADA | 17/10/1991 | 20 Kilometres Race Walk | Final | 14 | 1:31:53 |
| M | Toshikazu YAMANISHI | 15/02/1996 | 20 Kilometres Race Walk | Final | 1 | 1:19:07 |
| M | Koki IKEDA | 03/05/1998 | 20 Kilometres Race Walk | Final | 2 | 1:19:14 |
| M | Hiroto JUSHO | 11/01/2000 | 20 Kilometres Race Walk | Final | 8 | 1:20:39 |
| M | Eiki TAKAHASHI | 19/11/1992 | 20 Kilometres Race Walk | Final | 29 | 1:26:46 |
| M | Kosei YAMAGUCHI | 19/08/1991 | 3000 Metres Steeplechase | Heats | 10 | 8:30.92 |
| M | Ryoma AOKI | 16/06/1997 | 3000 Metres Steeplechase | Heats | 11 | 8:33.89 |
| M | Ryuji MIURA | 21/02/2002 | 3000 Metres Steeplechase | Heats | 5 | 8:21.80 |
| M | Yuki HASHIOKA | 23/01/1999 | Long Jump | Qualification | 1 | 8.18 |
| M | Natsuki YAMAKAWA | 24/07/1995 | Long Jump | Qualification | 12 | 7.75 |
| W | Ran URABE | 16/06/1995 | 1500 Metres | Heats | 14 | 4:14.82 |
| W | Nozomi TANAKA | 04/09/1999 | 1500 Metres | Heats | 7 | 4:05.30 |
| M | Ryuichiro SAKAI | 14/03/1998 | 100 Metres | Heats | 3 | 10.12 |
| M | Abdul Hakim SANI BROWN | 06/03/1999 | 100 Metres | Heats | 1 | 9.98 |
| Sex | Athlete | DOB | Discipline | Round | POS | Mark |
|---|---|---|---|---|---|---|
| W | Yuno YAMANAKA | 25/12/2000 | 3000 Metres Steeplechase | Heats | 14 | 10:18.18 |
| W | Reimi YOSHIMURA | 22/04/2000 | 3000 Metres Steeplechase | Heats | 14 | 9:58.07 |
| M | Shuhei ISHIKAWA | 29/05/1995 | 110 Metres Hurdles | Heats | 4 | 13.53 |
| M | Rachid MURATAKE | 06/02/2002 | 110 Metres Hurdles | Heats | 6 | 13.73 |
| M | Shunsuke IZUMIYA | 26/01/2000 | 110 Metres Hurdles | Heats | 3 | 13.56 |
| W | Ririka HIRONAKA | 24/11/2000 | 10,000 Metres | Final | 12 | 30:39.71 |
| W | Rino GOSHIMA | 29/10/1997 | 10,000 Metres | Final | 19 | 32:08.68 |
| M | Kazuki KUROKAWA | 17/06/2001 | 400 Metres Hurdles | Heats | 4 | 50.02 |
| M | Takayuki KISHIMOTO | 06/05/1990 | 400 Metres Hurdles | Heats | 6 | 50.66 |
| M | Abdul Hakim SANI BROWN | 06/03/1999 | 100 Metres | Semi-Final | 3 | 10.05 |
| M | Ryuichiro SAKAI | 14/03/1998 | 100 Metres | Semi-Final | 6 | 10.23 |
| M | Yuki HASHIOKA | 23/01/1999 | Long Jump | Final | 10 | 7.86 |
| W | Nozomi TANAKA | 04/09/1999 | 1500 Metres | Semi-Final | 6 | 4:05.79 |
| M | Abdul Hakim SANI BROWN | 06/03/1999 | 100 Metres | Final | 7 | 10.06 |
| Sex | Athlete | DOB | Discipline | Round | POS | Mark |
|---|---|---|---|---|---|---|
| M | Kengo SUZUKI | 11/06/1995 | Marathon | Final | DNS | |
| M | Gaku HOSHI | 17/09/1998 | Marathon | Final | 38 | 2:13:44 |
| M | Yusuke NISHIYAMA | 07/11/1994 | Marathon | Final | 13 | 2:08:35 |
| M | Julian Jrummi WALSH | 18/09/1996 | 400 Metres | Heats | 4 | 45.90 |
| M | Kaito KAWABATA | 17/08/1998 | 400 Metres | Heats | 5 | 46.34 |
| M | Fuga SATO | 01/06/1996 | 400 Metres | Heats | 4 | 45.88 |
| M | Ren TAZAWA | 11/11/2000 | 10,000 Metres | Final | 19 | 28:24.25 |
| M | Tatsuhiko ITO | 23/03/1998 | 10,000 Metres | Final | 21 | 28:57.85 |
| M | Shuhei ISHIKAWA | 29/05/1995 | 110 Metres Hurdles | Semi-Final | 8 | 13.68 |
| M | Shunsuke IZUMIYA | 26/01/2000 | 110 Metres Hurdles | Semi-Final | 5 | 13.42 |
| M | Kazuki KUROKAWA | 17/06/2001 | 400 Metres Hurdles | Semi-Final | 6 | 49.69 |
| Sex | Athlete | DOB | Discipline | Round | POS | Mark |
|---|---|---|---|---|---|---|
| W | Mizuki MATSUDA | 31/05/1995 | Marathon | Final | 9 | 2:23:49 |
| W | Hitomi NIIYA | 26/02/1988 | Marathon | Final | DNS | |
| M | Koki UEYAMA | 15/05/1999 | 200 Metres | Heats | 2 | 20.26 |
| M | Yuki KOIKE | 13/05/1995 | 200 Metres | Heats | DNS | |
| M | Shota IIZUKA | 25/06/1991 | 200 Metres | Heats | 3 | 20.72 |
| M | Tomohiro SHINNO | 17/08/1996 | High Jump | Final | 8 | 2.27 |
| Sex | Athlete | DOB | Discipline | Round | POS | Mark |
|---|---|---|---|---|---|---|
| M | Shota IIZUKA | 25/06/1991 | 200 Metres | Semi-Final | 7 | 20.77 |
| M | Koki UEYAMA | 15/05/1999 | 200 Metres | Semi-Final | 6 | 20.48 |
| Sex | Athlete | DOB | Discipline | Round | POS | Mark |
|---|---|---|---|---|---|---|
| W | Momone UEDA | 27/06/1999 | Javelin Throw | Qualification | 13 | 50.70 |
| W | Haruka KITAGUCHI | 16/03/1998 | Javelin Throw | Qualification | 1 | 64.32 |
| W | Sae TAKEMOTO | 23/11/1999 | Javelin Throw | Qualification | 7 | 59.15 |
| W | Nozomi TANAKA | 04/09/1999 | 5000 Metres | Heats | 8 | 15:00.21 |
| W | Kaede HAGITANI | 10/10/2000 | 5000 Metres | Heats | 14 | 15:53.39 |
| W | Ririka HIRONAKA | 24/11/2000 | 5000 Metres | Heats | 7 | 15:02.03 |
| M | Julian Jrummi WALSH | 18/09/1996 | 400 Metres | Semi-Final | 6 | 45.75 |
| M | Fuga SATO | 01/06/1996 | 400 Metres | Semi-Final | 5 | 45.71 |
| Sex | Athlete | DOB | Discipline | Round | POS | Mark |
|---|---|---|---|---|---|---|
| M | Roderick Genki DEAN | 30/12/1991 | Javelin Throw | Qualification | 4 | 82.34 |
| M | Kenji OGURA | 08/06/1995 | Javelin Throw | Qualification | 10 | 78.48 |
| W | Nozomi TANAKA | 04/09/1999 | 800 Metres | Heats | 7 | 2:03.56 |
| M | Hyuga ENDO | 05/08/1998 | 5000 Metres | Heats | 13 | 13:47.07 |
| Sex | Athlete | DOB | Discipline | Round | POS | Mark |
|---|---|---|---|---|---|---|
| W | Serena SONODA | 10/09/1996 | 35 Kilometres Race Walk | Final | 9 | 2:45:09 |
| M | Seito YAMAMOTO | 11/03/1992 | Pole Vault | Qualification | 7 | 5.65 |
| W | Japan | 4x100 Metres Relay | Heats | 7 | 43.33 | |
| M | Japan | 4x100 Metres Relay | Heats | DQ | ||
| W | Haruka KITAGUCHI | 16/03/1998 | Javelin Throw | Final | 3 | 63.27 |
| W | Sae TAKEMOTO | 23/11/1999 | Javelin Throw | Final | 11 | 57.93 |
| Sex | Athlete | DOB | Discipline | Round | POS | Mark |
|---|---|---|---|---|---|---|
| W | Mako FUKUBE | 28/10/1995 | 100 Metres Hurdles | Heats | 4 | 12.96 |
| W | Masumi AOKI | 16/04/1994 | 100 Metres Hurdles | Heats | 5 | 13.12 |
| W | Sumire HATA | 04/05/1996 | Long Jump | Qualification | 11 | 6.39 |
| M | Japan | 4x400 Metres Relay | Heats | 2 | 3:01.53 | |
| W | Nozomi TANAKA | 04/09/1999 | 5000 Metres | Final | 11 | 15:19.35 |
| M | Roderick Genki DEAN | 30/12/1991 | Javelin Throw | Final | 9 | 80.69 |
| Sex | Athlete | DOB | Discipline | Round | POS | Mark |
|---|---|---|---|---|---|---|
| M | Daisuke MATSUNAGA | 24/03/1995 | 35 Kilometres Race Walk | Final | 26 | 2:33:56 |
| M | Tomohiro NODA | 24/01/1996 | 35 Kilometres Race Walk | Final | 9 | 2:25:29 |
| M | Masatora KAWANO | 23/10/1998 | 35 Kilometres Race Walk | Final | 2 | 2:23:15 |
| W | Mako FUKUBE | 28/10/1995 | 100 Metres Hurdles | Semi-Final | 8 | 12.82 |
| W | Masumi AOKI | 16/04/1994 | 100 Metres Hurdles | Semi-Final | 6 | 13.04 |
| M | Japan | 4x400 Metres Relay | Final | 4 | 2:59.51 |