Yui Kobayashi

JapanJapanActive
Born
Dec 4, 2008 (17 years old)
Events
800 m · 400 m

Yui Kobayashi is a Japan sprinter, born on December 4, 2008. She competes primarily in the 400m, 800m and 1500m.

Her personal bests include 57.61 in the 400m, 2:08.69 in the 800m and 4:36.63 in the 1500m. She is currently active on the international athletics circuit, representing Japan.

Personal best · 800 m2:08.69
2026 season best2:10.54Aug 14, 2026 · Konoike Athletics Stadium, Nara
2026 season best
Personal best · 400 m57.61
Last competitionJapanese U20 Championships, Kusanagi Athletic Stadium, ShizuokaOct 3, 2026 · 4:29.46
Japanese U20 Championships, Kusanagi Athletic Stadium, Shizuoka

As of Nov 14, 2026: 800 m 2:08.69, 400 m 57.61, 2026 season best 2:10.54 (Aug 14, 2026, Konoike Athletics Stadium, Nara (JPN)) · Last competition: Japanese U20 Championships, Kusanagi Athletic Stadium, Shizuoka, Oct 3, 2026, 4:29.46 · 17 years old

Personal bests

WA points calculator →
DisciplineResultAll-time
400mOsaka 2025Japan 400 m all-time list57.61919 pts–
800mShizuoka 2025Japan 800 m all-time list2:08.691,012 pts–
1500mOsaka 2026Japan 1500 m all-time list4:36.63929 pts–

Progression

SeasonDisciplineResultWindDateCompetitions
2026400m 61.15–Mar 20, 2026the second ICAAK track and field game
2026800m 2:10.54–Aug 14, 2026Athlete Night Games Fukui
20261500m 4:29.46–Oct 3, 2026Japanese U20 Championships, Kusanagi Athletic Stadium, Shizuoka
2025400m 57.61–May 23, 202578th Osaka High School Championships, Yanmar Stadium Nagai, Osaka
2025800m 2:08.69–Sep 28, 2025Japanese U20 Championships, Kusanagi Athletic Stadium, Shizuoka
2024400m 60.47–Sep 14, 2024Kinki High School Rookies' Championships
2024800m 2:13.82–Jun 29, 2024Japanese U20 Championships, Denka Big Swan Stadium, Niigata
2023800m 2:16.24–Aug 27, 202371st Shikoku Athletics Championships/65th Shikoku Games
FAQ

Frequently asked questions

Yui Kobayashi's 800 m personal best is 2:08.69, set on Sep 28, 2025 in Kusanagi Athletic Stadium, Shizuoka (JPN).

Yui Kobayashi competes in the 800 m and 400 m.

2026 season best: 2:10.54, set on Aug 14, 2026 in Konoike Athletics Stadium, Nara (JPN). Last competition: Japanese U20 Championships, Kusanagi Athletic Stadium, Shizuoka on Oct 3, 2026, 4:29.46.