Kosei Shiraishi

Birth dateJun 23, 2002

Height-

Weight-

Kosei Shiraishi is a Japan middle-distance runner, born on June 23, 2002. He competes primarily in the 1500m, 5000m and 10000m.

His personal bests include 3:49.04 in the 1500m, 13:35.53 in the 5000m, 28:23.99 in the 10000m, 1:03:05 in the Semi and 2:08:42 in the Marathon. He is currently active on the international athletics circuit, representing Japan.

Key facts

Marathon

2:08:42

#996 all-time

10 000 m

28:23.99

2026 season best

2:15:00

Aug 30, 2026 · Osaka (JPN)

2026 season best

Last competition

TCS Sydney Marathon Presented by ASICS

Aug 30, 2026 · 2:15:00

TCS Sydney Marathon Presented by ASICS

Age

24 years old

As of Sep 26, 2026: Marathon 2:08:42 (#996 all-time), 10 000 m 28:23.99, 2026 season best 2:15:00 (Aug 30, 2026, Osaka (JPN)) · Last competition: TCS Sydney Marathon Presented by ASICS, Aug 30, 2026, 2:15:00 · 24 years old

Personal bests

3:49.04

13:35.53

28:23.99

1:03:05

2:08:42

5Kilometre

14:58

30Kilometr

1:32:57

Performance Charts

Season bests

Season	Discipline	Result	Wind	Date	Trend	Competitions
2026	5000m	14:00.67	-	Jun 12, 2026	↑	Japanese Championships
2026	Marathon	2:15:00	-	Aug 30, 2026	↓	TCS Sydney Marathon Presented by ASICS
2025	1500m	3:49.04	-	Jun 8, 2025	-	69th Kansai Inter-Corporate Track & Field Championships
2025	5000m	13:35.53	-	Jul 12, 2025	↑	HOKUREN Distance Challenge 2025 in Chitose, Aoba Park Athletic Field, Chitose
2025	10000m	28:55.90	-	Jul 19, 2025	↓	HOKUREN Distance Challenge 2025 in ABASHIRI, Athletic Track, Abashiri
2025	Marathon	2:08:42	-	Feb 2, 2025	↓	73rd Beppu-Oita Mainichi Marathon, Oita
2024	5000m	14:28.5h	-	Jun 15, 2024	↑	All Japan University Track & Field Challenge, Lemon Gas Stadium, Hiratsuka
2024	10000m	28:23.99	-	May 9, 2024	↓	The 103th Kanto Inter-University Track＆Field Championships, National Stadium, Tokyo
2024	Semi	1:03:05	-	Mar 10, 2024	↑	27th All Japan University Men's Half Marathon Championship
2023	5Kilometre	14:58	-	Mar 26, 2023	-	Adidas Tokyo City Race
2023	Semi	1:06:24	-	May 14, 2023	↑	102nd Kanto Inter-University Track & Field Championships, Gion Stadium, Sagamihara - 2nd Tier
2023	30Kilometr	1:32:57	-	Feb 19, 2023	-	Kanakuri Memorial 65th Kumanichi 30km Road Race
2022	5000m	15:09.71	-	Jun 5, 2022	↑	NITTAIDAI Athletic Stadium, Yokohama (JPN)
2022	Semi	1:04:03	-	Nov 13, 2022	↑	-
2021	5000m	13:51.21	-	Dec 5, 2021	↑	NITTAIDAI Athletic Stadium, Yokohama (JPN)
2021	10000m	28:49.65	-	Nov 24, 2021	↓	Municipal Stadium, Machida (JPN)
2021	Semi	1:04:11	-	Nov 14, 2021	↑	Tokyo (JPN)
2020	5000m	14:16.65	-	Oct 24, 2020	↑	Athletics Stadium, Konosu (JPN)

Discipline	Result	Wind	Date	Competitions
Marathon	2:15:00	-	Aug 30	TCS Sydney Marathon Presented by ASICS
5000m	14:00.67	-	Jun 12	Japanese Championships
Marathon	2:18:13	-	Feb 22	Osaka Marathon

Discipline	Result	Wind	Date	Competitions
10000m	28:55.90	-	Jul 19	HOKUREN Distance Challenge 2025 in ABASHIRI, Athletic Track, Abashiri
5000m	13:35.53	-	Jul 12	HOKUREN Distance Challenge 2025 in Chitose, Aoba Park Athletic Field, Chitose
1500m	3:49.04	-	Jun 8	69th Kansai Inter-Corporate Track & Field Championships
1500m	3:49.04	-	Jun 7	69th Kansai Inter-Corporate Track & Field Championships
Marathon	2:08:42	-	Feb 2	73rd Beppu-Oita Mainichi Marathon, Oita

Discipline	Result	Wind	Date	Competitions
5000m	14:28.5HT	-	Jun 15	All Japan University Track & Field Challenge, Lemon Gas Stadium, Hiratsuka
5000m	14:28.5HT	-	Jun 15	All Japan University Track & Field Challenge, Lemon Gas Stadium, Hiratsuka
10000m	28:23.99	-	May 9	The 103th Kanto Inter-University Track＆Field Championships, National Stadium, Tokyo
Semi	1:03:05	-	Mar 10	27th All Japan University Men's Half Marathon Championship

Discipline	Result	Wind	Date	Competitions
Semi	1:06:24	-	May 14	102nd Kanto Inter-University Track & Field Championships, Gion Stadium, Sagamihara - 2nd Tier
Semi	1:06:24	-	May 13	102nd Kanto Inter-University Track & Field Championships, Gion Stadium, Sagamihara - 2nd Tier
5Kilometre	14:58	-	Mar 26	Adidas Tokyo City Race
30Kilometr	1:32:57	-	Feb 19	Kanakuri Memorial 65th Kumanichi 30km Road Race

Discipline	Result	Wind	Date	Competitions
Semi	1:04:03	-	Nov 13	Miyako Salmon Half Marathon, Miyako
5000m	15:09.71	-	Jun 5	296th Nippon Sport Science University Long Distance Competition, NITTAIDAI Athletic Stadium, Yokohama

Discipline	Result	Wind	Date	Competitions
5000m	13:51.21	-	Dec 5	293th Nippon Sport Science University Long Distance Competition, NITTAIDAI Athletic Stadium, Yokohama
10000m	28:49.65	-	Nov 24	March Opposition, Municipal Stadium, Machida
Semi	1:04:11	-	Nov 14	Setagaya 246 Half Marathon, Tokyo
5000m	14:07.61	-	Jul 10	Hokuren Distance Challenge, Athletic Track, Abashiri
5000m	14:14.47	-	Jun 24	Japan U20 Championships, Yanmar Stadium Nagai, Osaka
5000m	14:10.49	-	Jun 6	288th Nittadai(NSSU) Distance Meet, NITTAIDAI Athletic Stadium, Yokohama
5000m	14:55.39	-	May 9	287th Nippon Sport Science University Long Distance Competition, NITTAIDAI Athletic Stadium, Yokohama

Discipline	Result	Wind	Date	Competitions
5000m	15:04.72	-	Nov 21	84th Heisei Kokusai University Long Distance Competition, Athletics Stadium, Konosu
5000m	14:16.65	-	Oct 24	83rd Heisei Kokusai University Long Distance Competition, Athletics Stadium, Konosu
5000m	15:12.80	-	Aug 22	Miyagi Prefectural Championships, Hitomebore Stadium, Miyagi
5000m	14:29.62	-	Jul 25	41st Sendai City Competition, Koshin Gom Athlete Park, Sendai

FAQ

Frequently asked questions

What is Kosei Shiraishi's Marathon personal best?

Kosei Shiraishi's Marathon personal best is 2:08:42, set on Feb 2, 2025 in Oita (JPN), #996 on the all-time list.

Which events does Kosei Shiraishi compete in?

Kosei Shiraishi competes in the Marathon and 10 000 m.

How did Kosei Shiraishi perform in 2026?

2026 season best: 2:15:00, set on Aug 30, 2026 in Osaka (JPN). Last competition: TCS Sydney Marathon Presented by ASICS on Aug 30, 2026, 2:15:00.

Kosei Shiraishi

Personal bests

Performance Charts

Season bests

2026

2025

2024

2023

2022

2021

2020

Honours

No medals

Frequently asked questions