(born 5 October 1957) is a retired Japanese long jumper, best known for finishing seventh at the 1984 Olympic Games.
Usui won the British AAA Championships title in the long jump event at the 1982 AAA Championships.
International competitions 1978Asian GamesBangkok, Thailand 2nd1979Asian ChampionshipsTokyo, Japan 1st7.97 m 1981Asian ChampionshipsTokyo, Japan 2nd1982Asian GamesNew Delhi, India 3rd1984Olympic Games Los Angeles, United States 7th1985Asian ChampionshipsJakarta, Indonesia 3rd1986Asian GamesSeoul, South Korea 2nd1987World Championships Rome, Italy 12th1988Olympic Games Seoul, South Korea —
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