KT
Kei Tsuboi

Kei Tsuboi

JPNJPNMen
Birth dateJun 22, 1997
Height-
Weight-

Kei Tsuboi is a Japan middle-distance runner, born on June 22, 1997. He competes primarily in the 1500m, 3000m and 5000m.

His personal bests include 3:51.80 in the 1500m, 8:22.81 in the 3000m, 14:16.65 in the 5000m, 28:56.85 in the 10000m and 1:03:25 in the Semi. He is currently active on the international athletics circuit, representing Japan.

Key facts
Half Marathon
1:03:25
10 000 m
28:56.85
2026 season best
2:25:05
Jun 7, 2026 · Botanic Gardens, Brisbane (AUS)
2026 season best
Last competition
Sunshine Coast Marathon Festival
Aug 2, 2026 · 2:27:57
Sunshine Coast Marathon Festival
Age
29 years old

As of Sep 20, 2026: Half Marathon 1:03:25, 10 000 m 28:56.85, 2026 season best 2:25:05 (Jun 7, 2026, Botanic Gardens, Brisbane (AUS)) · Last competition: Sunshine Coast Marathon Festival, Aug 2, 2026, 2:27:57 · 29 years old

PB

Personal bests

3:51.80
3000m
8:22.81
14:16.65
28:56.85
1:03:25
2:17:49
30Kilometr
1:33:34

Performance Charts

Season bests

SeasonDisciplineResultWindDateTrendCompetitions
2026
Marathon
2:25:05-Jun 7, 2026
↓
Brisbane Marathon Festival - Marathon
2025
30Kilometr
1:38:36-Feb 16, 2025
↓
57th The Ohme 30 & 10 km Road Race
2025
Marathon
2:18:37-Apr 6, 2025
↓
Gunsan Saemangeum Marathon
2024
Marathon
2:23:15-Mar 3, 2024
↓
Tokyo Marathon
2022
10000m
29:33.85-Jun 4, 2022
↓
NITTAIDAI Athletic Stadium, Yokohama (JPN)
2022
Marathon
2:17:49-Aug 28, 2022
↓
Sapporo (JPN)
2021
3000m
8:22.81-Apr 3, 2021-Komazawa Olympic Park Athletic Stadium, Tokyo (JPN)
2021
5000m
14:16.65-Apr 25, 2021
↑
NITTAIDAI Athletic Stadium, Yokohama (JPN)
2021
10000m
28:56.85-Dec 4, 2021
↓
NITTAIDAI Athletic Stadium, Yokohama (JPN)
2020
5000m
14:19.82-Jul 4, 2020
↑
Kokushikan University Stadium, Tama (JPN)
2019
Semi
1:03:25-Mar 10, 2019
↑
Tachikawa (JPN)
2019
30Kilometr
1:33:34-Feb 17, 2019
↓
Ohme-Hochi 30km Road Race
2017
Semi
1:05:50-Nov 19, 2017
↑
-
2015
1500m
3:51.80-Jul 29, 2015-Wakayama (JPN)

2026

3 performances
DisciplineResultWindDateCompetitions
Marathon
2:27:57-Aug 2Sunshine Coast Marathon Festival
Marathon
2:36:49-Jul 12Cairns Marathon Festival - Marathon
Marathon
2:25:05-Jun 7Brisbane Marathon Festival - Marathon

2025

4 performances
DisciplineResultWindDateCompetitions
Marathon
2:24:31-Nov 16Kobe Marathon
Marathon
2:24:29-Jun 1Brisbane Marathon Festival - Marathon, Botanic Gardens, Brisbane
Marathon
2:18:37-Apr 6Gunsan Saemangeum Marathon
30Kilometr
1:38:36-Feb 1657th The Ohme 30 & 10 km Road Race

2024

2 performances
DisciplineResultWindDateCompetitions
Marathon
2:35:32-Dec 8Honolulu Marathon, Honolulu, HI
Marathon
2:23:15-Mar 3Tokyo Marathon

2022

2 performances
DisciplineResultWindDateCompetitions
Marathon
2:17:49-Aug 28Hokkaido Marathon, Sapporo
10000m
29:33.85-Jun 4296th Nippon Sport Science University Long Distance Competition, NITTAIDAI Athletic Stadium, Yokohama

2021

5 performances
DisciplineResultWindDateCompetitions
10000m
28:56.85-Dec 4293th Nippon Sport Science University Long Distance Competition, NITTAIDAI Athletic Stadium, Yokohama
5000m
14:18.41-Nov 14292nd Nippon Sport Science University Long Distance Competition, NITTAIDAI Athletic Stadium, Yokohama
5000m
14:43.05-May 9287th Nippon Sport Science University Long Distance Competition, NITTAIDAI Athletic Stadium, Yokohama
5000m
14:16.65-Apr 25286th Nippon Sport Science University Long Distance Competition, NITTAIDAI Athletic Stadium, Yokohama
3000m
8:22.81-Apr 32nd Tokyo Rikukyo Middle Distance Challenge, Komazawa Olympic Park Athletic Stadium, Tokyo

2020

1 performance
DisciplineResultWindDateCompetitions
5000m
14:19.82-Jul 44th Kokushikan University Competition, Kokushikan University Stadium, Tama

2019

4 performances
DisciplineResultWindDateCompetitions
Semi
1:06:38-May 26Kanto District Collegiate Championships, Sagamihara
Semi
1:03:25-Mar 10Japan Univ. Half Marathon Ch., Tachikawa
30Kilometr
1:33:34-Feb 17Ohme-Hochi 30km Road Race
Semi
1:03:40-Feb 3Half Marathon, Kanagawa

2017

1 performance
DisciplineResultWindDateCompetitions
Semi
1:05:50-Nov 19Ageo City Half Marathon, Ageo

2015

1 performance
DisciplineResultWindDateCompetitions
1500m
3:51.80-Jul 29Wakayama Japanese High School Championships, Wakayama

Honours

No medals

FAQ

Frequently asked questions

What is Kei Tsuboi's Half Marathon personal best?

Kei Tsuboi's Half Marathon personal best is 1:03:25, set on Mar 10, 2019 in Tachikawa (JPN).

Which events does Kei Tsuboi compete in?

Kei Tsuboi competes in the Half Marathon and 10 000 m.

How did Kei Tsuboi perform in 2026?

2026 season best: 2:25:05, set on Jun 7, 2026 in Botanic Gardens, Brisbane (AUS). Last competition: Sunshine Coast Marathon Festival on Aug 2, 2026, 2:27:57.