Federation · JPN
Japan national best marks
Best mark per athlete by Japan athletes in each event, compiled from the all-time lists we import. Derived national bests — not official national records (see note below).
28
Stored athletes
27
Distinct marks shown
Men's 400mH
Derived 14 Sep 2026
| # | Athlete | Mark | Date | Venue | Age |
|---|---|---|---|---|---|
| 1 | Dai Tamesue | 47.89 | 10 Aug 2001 | — | — |
| 2 | Kenji Narisako | 47.93 | 6 May 2006 | — | — |
| 3 | Ken Toyoda | 47.99 | 28 Jun 2024 | — | — |
| 4 | Taiju Goto | 48.09 | 14 Jun 2026 | — | — |
| 5 | Kazuhiko Yamazaki | 48.26 | 8 May 1999 | — | — |
| 6 | Shunji Karube | 48.34 | 5 Oct 1997 | — | — |
| 7 | Kazuki Kurokawa | 48.35 | 10 May 2026 | — | — |
| 8 | Takayuki Kishimoto | 48.41 | 9 Jun 2012 | — | — |
| 9 | Shunta Inoue | 48.46 | 21 Sep 2024 | — | — |
| 10 | Shu Watanabe | 48.51 | 21 Sep 2024 | — | — |
| 11 | Kaito Tsutsue | 48.55 | 10 May 2026 | — | — |
| 12 | Hayato Shimoda | 48.59 | 21 Sep 2024 | — | — |
| 13 | Daiki Ogawa | 48.61 | 11 May 2025 | — | — |
| 14 | Keisuke Nozawa | 48.62 | 15 Aug 2016 | — | — |
| 15 | Yoshihiko Saito | 48.64 | 4 Oct 1998 | — | — |
| 15= | Matodzi Ndo | 48.64 | 28 Mar 2026 | — | — |
| 17 | Yoshihiro Chiba | 48.65 | 20 May 2001 | — | — |
| 18 | Masahira Yoshikata | 48.66 | 19 Sep 2005 | — | — |
| 19 | Takatoshi Abe | 48.68 | 3 May 2018 | — | — |
| 20 | Yusaku Kodama | 48.77 | 21 May 2023 | — | — |
| 21 | Syota Fichigami | 48.78 | 21 Sep 2024 | — | — |
| 22 | Hiromu Yamauchi | 48.79 | 3 Aug 2025 | — | — |
| 23 | Haruto Deguchi | 48.83 | 12 May 2024 | — | — |
| 24 | Hideaki Kawamura | 48.84 | 9 Sep 2000 | — | — |
| 25 | Ken Yoshizawa | 48.85 | 10 Jul 2004 | — | — |
| 26 | Masaki Toyoda | 48.87 | 9 May 2021 | — | — |
| 27 | Ryo Kajiki | 48.92 | 22 Sep 2019 | — | — |
| 28 | Kazuya Shogata | 48.95 | 19 Sep 2005 | — | — |
One mark per athlete — the athlete's best while representing Japan. Equal marks share a rank ("1=" style). An athlete with marks for two nations appears under each nation represented at the time (e.g. Obikwelu under Nigeria and Portugal).
About this derivation
These lists are derived from the marks in our database — including the complete legal all-time lists imported from alltime-athletics.com — grouped by the nation the athlete was representing at each mark. They are not official national records: federations ratify national records under their own eligibility rules, and some marks here may not qualify.