SI
Seiji Inagaki

Seiji Inagaki

JPNJPNMen
Birth dateApr 28, 1973
Height-
Weight-

Seiji Inagaki is a Japan sprinter, born on April 28, 1973. He competes primarily in the 400m, 400mH and 4x400m.

His personal bests include 45.60 in the 400m, 50.01 in the 400mH, 3:03.21 in the 4x400m, 3:07.30 in the 4x400Metre and 47.21 in the 400m-short-track. He has earned 1 silver and 2 bronze medals in major international competitions. He is currently active on the international athletics circuit, representing Japan.

Key facts
400 m
45.60
400 m hurdles
50.01
1998 season best
46.71
May 5, 1998
1998 season best
Age
53 years old

As of Sep 18, 2026: 400 m 45.60, 400 m hurdles 50.01, 1998 season best 46.71 (May 5, 1998) · 53 years old

Performance Charts

Season bests

SeasonDisciplineResultWindDateTrendCompetitions
1998
400m
46.71-May 5, 1998
↓
-
1997
400m
45.60-Sep 6, 1997
↓
-
1997
400m-short-track
47.21-Mar 1, 1997
↑
-
1997
4x400m
3:03.85-Aug 9, 1997
↓
IAAF World Championships, Olympic Stadium, Athina
1995
400m
46.19-May 19, 1995
↓
-
1995
400m-short-track
47.59-Mar 10, 1995
↑
IAAF World Indoor Championships
1995
4x400Metre
3:09.73-Mar 12, 1995
↓
IAAF World Indoor Championships
1994
400m
45.84-Oct 11, 1994
↓
-
1993
4x400m
3:03.21-Jul 18, 1993
↓
-
1993
4x400Metre
3:07.30-Mar 13, 1993
↓
IAAF World Indoor Championships, The Sky Dome, Toronto (i)
1992
400m
46.36-Jun 14, 1992
↓
-
1992
400mH
52.50-Sep 16, 1992
↓
-
1991
400mH
50.01-Oct 14, 1991
↓
-

1998

3 performances
DisciplineResultWindDateCompetitions
400m
49.01-May 16Portland adidas Oregon Track Classic, Portland, OR
400m
46.71-May 5Mito
400m
47.05-Apr 26Maebashi Gunma Relays CE, Maebashi

1997

4 performances
DisciplineResultWindDateCompetitions
400m
45.60-Sep 6Tokyo Toto Super Meet, Tokyo
4x400m
3:03.85-Aug 9IAAF World Championships, Olympic Stadium, Athina
4x400m
3:03.85-Aug 2IAAF World Championships, Olympic Stadium, Athina
400m-short-track
47.21-Mar 1Yokohama (i)

1995

4 performances
DisciplineResultWindDateCompetitions
400m
46.19-May 19Tokyo
4x400Metre
3:09.73-Mar 12IAAF World Indoor Championships
400m-short-track
47.59-Mar 10IAAF World Indoor Championships
4x400Metre
3:09.73-Mar 10IAAF World Indoor Championships

1994

2 performances
DisciplineResultWindDateCompetitions
400m
46.65-Oct 12Hiroshima Asian Games, Hiroshima
400m
45.84-Oct 11Hiroshima Asian Games, Hiroshima

1993

3 performances
DisciplineResultWindDateCompetitions
4x400m
3:03.21-Jul 18Buffalo Universiade, Buffalo, NY
4x400Metre
3:07.30-Mar 13IAAF World Indoor Championships, The Sky Dome, Toronto (i)
4x400Metre
3:07.30-Mar 12IAAF World Indoor Championships, The Sky Dome, Toronto (i)

1992

3 performances
DisciplineResultWindDateCompetitions
400mH
53.15-Sep 17Seoul IAAF World Junior Championships, Olympic Stadium, Seoul
400mH
52.50-Sep 16Seoul IAAF World Junior Championships, Olympic Stadium, Seoul
400m
46.36-Jun 14Tokyo NC, Tokyo

1991

1 performance
DisciplineResultWindDateCompetitions
400mH
50.01-Oct 14Kanazawa

Honours

🥉

IAAF World Indoor Championships

4x400 Metres Relay Short Track

1995
🥉

IAAF World Indoor Championships

4x400 Metres Relay Short Track

1993
🥈

Buffalo Universiade

4x400 Metres Relay

1993
FAQ

Frequently asked questions

What is Seiji Inagaki's 400 m personal best?

Seiji Inagaki's 400 m personal best is 45.60, set on Sep 6, 1997 in Tokyo (JPN).

Which events does Seiji Inagaki compete in?

Seiji Inagaki competes in the 400 m and 400 m hurdles.

How did Seiji Inagaki perform in 1998?

1998 season best: 46.71, set on May 5, 1998.