Koki Miyajima

JapanJapan
Born
Sep 18, 2007 (19 years old)
Events
400 m

Koki Miyajima is a Japan sprinter, born on September 18, 2007. He competes primarily in the 400m, 400mH and 300MetresH.

His personal bests include 51.44 in the 400m, 55.11 in the 400mH and 39.14 in the 300MetresH. He is currently active on the international athletics circuit, representing Japan.

Personal best · 400 m51.44
2025 season best51.46May 2, 2025 · Ijimino Park Athletics Stadium, Shibata
2025 season best
Last competition68th Hokuriku area Athletics ChampionshipsAug 24, 2025 · 59.65
68th Hokuriku area Athletics Championships

As of Nov 14, 2026: 400 m 51.44, 2025 season best 51.46 (May 2, 2025, Ijimino Park Athletics Stadium, Shibata (JPN)) · Last competition: 68th Hokuriku area Athletics Championships, Aug 24, 2025, 59.65 · 19 years old

Personal bests

WA points calculator →
DisciplineResultAll-time
400mNiigata 2024Japan 400 m all-time list51.44775 pts–
400mHNagaoka 2025Japan 400 m hurdles all-time list55.11890 pts–
300MetresHNagaoka 202539.14–

Progression

SeasonDisciplineResultWindDateCompetitions
2025300MetresH 39.14–Jul 19, 202579th Niigata Pref Championships
2025400m 51.46–May 2, 2025Niigata Kaetsu Sado area High School Meeting, Ijimino Park Athletics Stadium, Shibata
2025400mH 55.11–Jul 20, 202579th Niigata Pref Championships
2024400m 51.44–Jul 13, 202478th Niigata Pref Championships
FAQ

Frequently asked questions

Koki Miyajima's 400 m personal best is 51.44, set on Jul 13, 2024 in Denka Big Swan Stadium, Niigata (JPN).

Koki Miyajima competes in the 400 m.

2025 season best: 51.46, set on May 2, 2025 in Ijimino Park Athletics Stadium, Shibata (JPN). Last competition: 68th Hokuriku area Athletics Championships on Aug 24, 2025, 59.65.