Results for Japan in 400 metres, Men

Olympic and Intercalated results only.
Games Athlete/Team Placement
1912 Summer Olympics Yahiko Mishima 2 h4 r1/3
1920 Summer Olympics Gensabulo Noguchi DNS
Shinichi Yamaoka DNS
1924 Summer Olympics Tokushige Noto 5 h6 r2/4
1928 Summer Olympics Iwao Aizawa DNS
1932 Summer Olympics Iwao Masuda 6 h1 r2/4
Seikan Oki 6 h2 r2/4
Zhang Hsing-Hsien 5 h5 r1/4
1936 Summer Olympics Toyoji Aihara 4 h7 r1/4
Keiji Imai 5 h5 r1/4
Hiroyoshi Kubota 6 h4 r1/4
1952 Summer Olympics Junkichi Matoba 3 h4 r1/4
Eitaro Okano DNS
1956 Summer Olympics Kanji Akagi AC h1 r1/4
1960 Summer Olympics Hirotada Hayase 6 h1 r1/4
1964 Summer Olympics Hirotada Hayase 6 h7 r1/4
1972 Summer Olympics Yoshiharu Tomonaga 6 h4 r2/4
1984 Summer Olympics Susumu Takano 8 h1 r3/4
1988 Summer Olympics Susumu Takano 5 h1 r3/4
1992 Summer Olympics Susumu Takano 8
Takahiro Watanabe 5 h9 r1/4
1996 Summer Olympics Shigekazu Omori 4 h3 r1/4
2000 Summer Olympics Jun Osakada 8 h2 r2/4
Takahiko Yamamura 5 h1 r1/4
Kenji Tabata 6 h8 r1/4
2004 Summer Olympics Jun Osakada 5 h1 r1/3
Mitsuhiro Sato 5 h3 r1/3
Yuki Yamaguchi 5 h7 r1/3
2008 Summer Olympics Yuzo Kanemaru 7 h4 r1/3
2012 Summer Olympics Yuzo Kanemaru 4 h5 r1/3
2016 Summer Olympics Julian Walsh 6 h4 r1/3
Yuzo Kanemaru 8 h7 r1/3
2020 Summer Olympics Julian Walsh 6 h4 r1/3
2024 Summer Olympics Fuga Sato DNSh1 r2/4
Yuki Joseph Nakajima DNSh2 r2/4
Kentaro Sato DNSh3 r2/4