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).
1
Stored athletes
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Distinct marks shown
Men's Hammer
Derived 14 Sep 2026
| # | Athlete | Mark | Date | Venue | Age |
|---|---|---|---|---|---|
| 1 | Koji Murofushi | 84.86 | 29 Jun 2003 | — | 28 |
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.