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).
11
Stored athletes
11
Distinct marks shown
Men's 400m
Derived 14 Sep 2026
| # | Athlete | Mark | Date | Venue | Age |
|---|---|---|---|---|---|
| 1 | Yuki Joseph Nakajima | 44.44 | 14 Sep 2025 | — | — |
| 2 | Kentaro Sato | 44.77 | 20 Aug 2023 | — | — |
| 3 | Susumu Takano | 44.78 | 16 Jun 1991 | — | — |
| 4 | Fuga Sato | 44.88 | 22 Aug 2023 | — | — |
| 5 | Takahiko Yamamura | 45.03 | 9 Sep 2000 | — | — |
| 6 | Jun Osakada | 45.05 | 9 Sep 2000 | — | — |
| 7 | Julian Jrummi Walsh | 45.13 | 2 Oct 2019 | — | — |
| 8 | Yuzo Kanemaru | 45.16 | 9 May 2009 | — | — |
| 9 | Yuki Yamaguchi | 45.18 | 29 Oct 2003 | — | — |
| 10 | Tatsuki Iwasaki | 45.19 | 29 Jul 2023 | — | — |
| 11 | Yuki Yamazaki | 45.20 | 1 Aug 2004 | — | — |
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.