100 m: 11.39 (2004) Motoka Arai (新井 初佳, Arai Motoka, born 16 June 1974 in Kobe) is a Japanese retired sprinter.

[4] She was a seven-time national champion in the 100 metres and a six-time national champion in the 200 metres at the Japanese Championships.

She married Japanese sprinter Shigeyuki Kojima in February 2004.

[5] She changed her name to Motoka Kojima, but she reverted to her original name.

This biographical article relating to Japanese athletics is a stub.