Hiroki Kosaka

JapanJapanActive
Born
Jul 31, 2005 (21 years old)
Events
400 m

Hiroki Kosaka is a Japan sprinter, born on July 31, 2005. He competes primarily in the 100m, 200m and 400m.

His personal bests include 11.22 in the 100m, 22.49 in the 200m, 47.69 in the 400m, 3:07.26 in the 4x400m and 34.68 in the 300m. He is currently active on the international athletics circuit, representing Japan.

Personal best · 400 m47.69
2026 season best47.54Jul 18, 2026 · Hakatanomori Athletic Stadium, Fukuoka
2026 season best
Last competition81st Kyushu Athletics ChampionshipsAug 21, 2026 · 48.54
81st Kyushu Athletics Championships

As of Nov 14, 2026: 400 m 47.69, 2026 season best 47.54 (Jul 18, 2026, Hakatanomori Athletic Stadium, Fukuoka (JPN)) · Last competition: 81st Kyushu Athletics Championships, Aug 21, 2026, 48.54 · 21 years old

Personal bests

WA points calculator →
DisciplineResultAll-time2026
100mFukuoka 2023Japan 100 m all-time list11.22*822 pts––
200mFukuoka 2022Japan 200 m all-time list22.49*859 pts––
400mFukuoka 2026Japan 400 m all-time list47.691,001 pts––
4x400mOsaka 2026Japan 4 × 400 m all-time list3:07.26–#581
300mFukuoka 202234.68928 pts–#394

* Wind-assisted (> 2.0 m/s)

Progression

SeasonDisciplineResultWindDateCompetitions
2026300m 34.93–Apr 4, 2026Spring - Hakata Record Meeting Games
2026400m 47.54–Jul 18, 2026Fukuoka University Competition
20264x400m 3:07.26–Jun 21, 2026The 79th West-Japan Inter-Unversity Track＆ Field Championships
2025200m 22.74+0.7Aug 10, 20252025 Summer Record Meeting, Hakatanomori Athletic Stadium, Fukuoka
2025400m 48.19–Sep 28, 2025The 53rd Kyushu University Track & Field Championships, Hakatanomori Athletic Stadium, Fukuoka
20254x400m 3:08.62–Sep 14, 2025The 78th West-Japan Inter-Unversity Athletc Championships
2024400m 48.93–Aug 10, 20242024 Summer Record Meeting
20244x400m 3:16.69–May 11, 2024The 94th Kyushu Inter University Track & Field Championships, Kamoike Auxiliary Stadium, Kagoshima
FAQ

Frequently asked questions

Hiroki Kosaka's 400 m personal best is 47.69, set on Apr 12, 2026 in Hakatanomori Athletic Stadium, Fukuoka (JPN).

Hiroki Kosaka competes in the 400 m.

2026 season best: 47.54, set on Jul 18, 2026 in Hakatanomori Athletic Stadium, Fukuoka (JPN). Last competition: 81st Kyushu Athletics Championships on Aug 21, 2026, 48.54.