Seinosuke Irizuki

JapanJapanActive
Born
Jun 6, 2005 (21 years old)
Events
400 m · 300 Metres

Seinosuke Irizuki is a Japan sprinter, born on June 6, 2005. He competes primarily in the 100m, 200m and 400m.

His personal bests include 11.03 in the 100m, 21.10 in the 200m, 45.57 in the 400m, 40.98 in the 4x100m and 3:07.40 in the 4x400m. He is currently active on the international athletics circuit, representing Japan.

Personal best · 400 m45.57
2026 season best45.57Jun 13, 2026 · Municipal Mizuho Stadium, Nagoya
2026 season best
Personal best · 300 Metres32.95
Last competition95th Japan Inter-University Athletics ChampionshipsSep 5, 2026 · 47.10
95th Japan Inter-University Athletics Championships

As of Nov 6, 2026: 400 m 45.57, 300 Metres 32.95, 2026 season best 45.57 (Jun 13, 2026, Municipal Mizuho Stadium, Nagoya (JPN)) · Last competition: 95th Japan Inter-University Athletics Championships, Sep 5, 2026, 47.10 · 21 years old

Personal bests

WA points calculator →
DisciplineResultAll-time2026
100mKofu 2022Japan 100 m all-time list11.03877 pts––
200mSagamihara 2024Japan 200 m all-time list21.10*1,053 pts––
400mNagoya 2026Japan 400 m all-time list45.571,141 pts–#209
4x100mFukuroi 2024Japan 4 × 100 m all-time list40.98––
4x400mOkayama 2025Japan 4 × 400 m all-time list3:07.40–#769
300mHikone 202532.951,076 pts––

* Wind-assisted (> 2.0 m/s)

Progression

Compare me
SeasonDisciplineResultWindDateCompetitions
2026400m 45.57–Jun 13, 2026Japanese Championships
20264x400m 3:08.28–May 24, 2026The 105th Kanto Inter-University Track＆Field Championships
2025200m 21.31+0.4May 10, 2025The 104th Kanto Inter-University Track＆Field Championships, Gion Stadium, Sagamihara
2025300m 32.95–Oct 3, 2025Japan Games, Athletic Stadium, Hikone
2025400m 46.26–Jun 5, 202594th Japan Inter-University Athletics Championships
20254x400m 3:07.40–Jun 7, 202594th Japan Inter-University Athletics Championships
2024200m 21.10+2.3Sep 29, 202435th Kanto University Rookies Athletics Championships
2024300m 33.38–Oct 11, 2024National Sports Festival 2024 Saga
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FAQ

Frequently asked questions

Seinosuke Irizuki's 400 m personal best is 45.57, set on Jun 13, 2026 in Municipal Mizuho Stadium, Nagoya (JPN).

Seinosuke Irizuki competes in the 400 m and 300 Metres.

2026 season best: 45.57, set on Jun 13, 2026 in Municipal Mizuho Stadium, Nagoya (JPN). Last competition: 95th Japan Inter-University Athletics Championships on Sep 5, 2026, 47.10.