Federation · JPN
Japan national best marks
Best marks by Japan athletes in each event, compiled from the all-time lists we import. Derived national bests — not official national records (see note below).
36
Stored marks
25
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 | Yuki Joseph Nakajima | 44.53 | 16 Sep 2025 | — | — |
| 3 | Yuki Joseph Nakajima | 44.62 | 18 Sep 2025 | — | — |
| 3= | Yuki Joseph Nakajima | 44.62 | 27 Aug 2026 | — | — |
| 5 | Kentaro Sato | 44.77 | 20 Aug 2023 | — | — |
| 6 | Susumu Takano | 44.78 | 16 Jun 1991 | — | — |
| 7 | Yuki Joseph Nakajima | 44.84 | 3 Aug 2025 | — | — |
| 8 | Fuga Sato | 44.88 | 22 Aug 2023 | — | — |
| 9 | Susumu Takano | 44.90 | 26 Sep 1988 | — | — |
| 10 | Susumu Takano | 44.91 | 26 Aug 1991 | — | — |
| 11 | Fuga Sato | 44.97 | 20 Aug 2023 | — | — |
| 12 | Kentaro Sato | 44.99 | 22 Aug 2023 | — | — |
| 13 | Susumu Takano | 45.00 | 1 Oct 1986 | — | — |
| 13= | Susumu Takano | 45.00 | 25 Sep 1988 | — | — |
| 13= | Kentaro Sato | 45.00 | 13 Jul 2023 | — | — |
| 16 | Takahiko Yamamura | 45.03 | 9 Sep 2000 | — | — |
| 17 | Yuki Joseph Nakajima | 45.04 | 22 Aug 2023 | — | — |
| 18 | Jun Osakada | 45.05 | 9 Sep 2000 | — | — |
| 19 | Susumu Takano | 45.09 | 25 May 1991 | — | — |
| 19= | Susumu Takano | 45.09 | 3 Aug 1992 | — | — |
| 21 | Yuki Joseph Nakajima | 45.10 | 20 Aug 2025 | — | — |
| 21= | Fuga Sato | 45.10 | 14 Sep 2025 | — | — |
| 23 | Yuki Joseph Nakajima | 45.12 | 22 Jul 2023 | — | — |
| 23= | Yuki Joseph Nakajima | 45.12 | 1 Oct 2023 | — | — |
| 25 | Julian Jrummi Walsh | 45.13 | 2 Oct 2019 | — | — |
| 25= | Fuga Sato | 45.13 | 13 Jul 2023 | — | — |
| 27 | Julian Jrummi Walsh | 45.14 | 1 Oct 2019 | — | — |
| 28 | Yuki Joseph Nakajima | 45.15 | 4 Jun 2023 | — | — |
| 28= | Yuki Joseph Nakajima | 45.15 | 20 Aug 2023 | — | — |
| 30 | Yuzo Kanemaru | 45.16 | 9 May 2009 | — | — |
| 30= | Fuga Sato | 45.16 | 3 Aug 2025 | — | — |
| 32 | Susumu Takano | 45.18 | 5 Aug 1992 | — | — |
| 32= | Yuki Yamaguchi | 45.18 | 29 Oct 2003 | — | — |
| 34 | Tatsuki Iwasaki | 45.19 | 29 Jul 2023 | — | — |
| 34= | Yuki Joseph Nakajima | 45.19 | 2 Sep 2023 | — | — |
| 36 | Yuki Yamazaki | 45.20 | 1 Aug 2004 | — | — |
Every mark in scope within the compiled depth. 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.