SI

Seinosuke Irizuki

JPNJPNMen
Birth dateJun 6, 2005
Height-
Weight-

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.

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

As of Sep 16, 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

PB

Personal bests

11.03
21.10*
45.57
40.98
3:07.40
32.95

* Wind-assisted (> 2.0 m/s)

Performance Charts

Season bests

SeasonDisciplineResultWindDateTrendCompetitions
2026
400m
45.57-Jun 13, 2026
↑
Japanese Championships
2026
4x400m
3:08.28-May 24, 2026
↓
The 105th Kanto Inter-University Track＆Field Championships
2025
200m
21.31+0.4May 10, 2025
↑
The 104th Kanto Inter-University Track＆Field Championships, Gion Stadium, Sagamihara
2025
300m
32.95-Oct 3, 2025
↑
Japan Games, Athletic Stadium, Hikone
2025
400m
46.26-Jun 5, 2025
↑
94th Japan Inter-University Athletics Championships
2025
4x400m
3:07.40-Jun 7, 2025
↓
94th Japan Inter-University Athletics Championships
2024
200m
21.10+2.3Sep 29, 2024
↑
35th Kanto University Rookies Athletics Championships
2024
300m
33.38-Oct 11, 2024
↑
National Sports Festival 2024 Saga
2024
4x100m
40.98-Nov 2, 2024-Ecopa Track Games, Prefectural Shizuoka Stadium, Fukuroi
2024
400m
46.83-Jun 29, 2024
↑
Japanese U20 Championships, Denka Big Swan Stadium, Niigata
2024
4x400m
3:07.85-Sep 21, 2024
↓
93rd Japan Inter-University Athletics Championships
2023
200m
21.34+1.0Aug 6, 2023
↑
Fuji Hokuroku World Trials 2023
2023
300m
33.82-Oct 13, 2023
↑
National Sports Festival
2023
400m
47.96-Aug 2, 2023
↑
Inter-High School Championships, Atsubetsu Park Stadium, Sapporo
2022
100m
11.03+0.1Apr 17, 2022
↑
JIT Recycled Ink Stadium, Kofu (JPN)
2022
200m
22.26-1.9Sep 3, 2022
↑
JIT Recycled Ink Stadium, Kofu (JPN)
2022
400m
48.78-Aug 19, 2022
↑
JIT Recycled Ink Stadium, Kofu (JPN)
2021
100m
11.09+0.7Jul 17, 2021
↑
JIT Recycled Ink Stadium, Kofu (JPN)

2026

18 performances
DisciplineResultWindDateCompetitions
400m
47.10-Sep 595th Japan Inter-University Athletics Championships
400m
46.59-Sep 595th Japan Inter-University Athletics Championships
400m
46.33-Aug 9Fuji Hokuroku World Trial
400m
46.61-Jun 14Japanese Championships
400m
45.57-Jun 13Japanese Championships
400m
46.61-Jun 12Japanese Championships
4x400m
3:08.28-May 24The 105th Kanto Inter-University Track＆Field Championships
4x400m
3:09.03-May 23The 105th Kanto Inter-University Track＆Field Championships
400m
46.51-May 22The 105th Kanto Inter-University Track＆Field Championships
400m
46.96-May 21The 105th Kanto Inter-University Track＆Field Championships
400m
47.74-May 21The 105th Kanto Inter-University Track＆Field Championships
400m
45.71-May 17SEIKO Golden Grand Prix
400m
46.70-May 341st Shizuoka International Athletics Meet
400m
46.75-Apr 25All Japan University Track & Field Challenge
400m
47.03-Apr 24All Japan University Track & Field Challenge
400m
46.75-Apr 24All Japan University Track & Field Challenge
400m
47.72-Apr 24All Japan University Track & Field Challenge
400m
46.31-Mar 28Track Games in Tokorozawa, Mikio Oda Memorial Athletic Field, Tokorozawa

2025

25 performances
DisciplineResultWindDateCompetitions
300m
32.95-Oct 5Japan Games, Athletic Stadium, Hikone
300m
32.95-Oct 3Japan Games, Athletic Stadium, Hikone
4x400m
3:13.89-Sep 28The 36th Rookie Athletics Championships and Relay Competition, Gion Stadium, Sagamihara
4x400m
3:13.96-Sep 27The 36th Rookie Athletics Championships and Relay Competition, Gion Stadium, Sagamihara
400m
46.79-Aug 20The 20th Twilight Games, International Stadium, Yokohama
4x400m
3:09.28-Jul 12Japanese Relays Championships, Nagaragawa Stadium, Gifu
400m
46.26-Jul 5Japanese Championships, National Stadium, Tokyo
400m
46.29-Jul 4Japanese Championships, National Stadium, Tokyo
4x400m
3:07.40-Jun 794th Japan Inter-University Athletics Championships
400m
46.26-Jun 694th Japan Inter-University Athletics Championships
400m
46.36-Jun 694th Japan Inter-University Athletics Championships
400m
47.01-Jun 694th Japan Inter-University Athletics Championships
400m
46.26-Jun 594th Japan Inter-University Athletics Championships
200m
21.31+0.4May 10The 104th Kanto Inter-University Track＆Field Championships, Gion Stadium, Sagamihara
4x400m
3:13.19-May 10The 104th Kanto Inter-University Track＆Field Championships, Gion Stadium, Sagamihara
400m
46.86-May 9The 104th Kanto Inter-University Track＆Field Championships, Gion Stadium, Sagamihara
400m
47.26-May 9The 104th Kanto Inter-University Track＆Field Championships, Gion Stadium, Sagamihara
200m
21.31+0.4May 9The 104th Kanto Inter-University Track＆Field Championships, Gion Stadium, Sagamihara
400m
47.26-May 8The 104th Kanto Inter-University Track＆Field Championships, Gion Stadium, Sagamihara
400m
46.86-May 8The 104th Kanto Inter-University Track＆Field Championships, Gion Stadium, Sagamihara
400m
46.45-May 340th Shizuoka International Athletics Meet, Prefectural Shizuoka Stadium, Fukuroi
400m
47.00-Apr 26All Japan University Track & Field Challenge, Tokai University Stadium, Hiratsuka
400m
46.83-Apr 26All Japan University Track & Field Challenge, Tokai University Stadium, Hiratsuka
400m
47.00-Apr 25All Japan University Track & Field Challenge, Tokai University Stadium, Hiratsuka
400m
46.83-Apr 25All Japan University Track & Field Challenge, Tokai University Stadium, Hiratsuka
Showing 1 - 50 of 86

Honours

No medals

FAQ

Frequently asked questions

What is Seinosuke Irizuki's 400 m personal best?

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

Which events does Seinosuke Irizuki compete in?

Seinosuke Irizuki competes in the 400 m and 300 Metres.

How did Seinosuke Irizuki perform in 2026?

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.