Results for Japan in 400 metres Individual Medley, Women

Olympic and Intercalated results only.

Games	Athlete/Team	Placement
1964 Summer Olympics	Kimiko Ezaka	13
	Natsuko Matsuda	19
1972 Summer Olympics	Yukari Takemoto	18
1984 Summer Olympics	Hideka Koshimizu	14
1988 Summer Olympics	Yoshie Nishioka	19
	Hiroyo Harada	23
1992 Summer Olympics	Hideko Hiranaka	5
	Eri Kimura	7
1996 Summer Olympics	Fumie Kurotori	12
	Hideko Hiranaka	13
2000 Summer Olympics	Yasuko Tajima	2	Silver
2004 Summer Olympics	Misa Amano	10
2008 Summer Olympics	Maiko Fujino	11
	Saori Haruguchi	27
2012 Summer Olympics	Miyu Otsuka	12
	Miho Takahashi	20
2016 Summer Olympics	Sakiko Shimizu	8
	Miho Takahashi	=10
2020 Summer Olympics	Yui Ohashi	1	Gold
	Ageha Tanigawa	12
2024 Summer Olympics	Mio Narita	6
	Ageha Tanigawa	13