List of Japanese records in swimming
Men
Legend: # – Record awaiting ratification by Japan Swimming Federation; WR – World record; AS – Asian record; Records not set in finals: h – heat; sf – semifinal; r – relay 1st leg; rh – relay heat 1st leg; b – B final; † – en route to final mark; tt – time trial

List of Japanese records in swimming

Section Title: Men
Table Section Text: Legend: # – Record awaiting ratification by Japan Swimming Federation; WR – World record; AS – Asian record; Records not set in finals: h – heat; sf – semifinal; r – relay 1st leg; rh – relay heat 1st leg; b – B final; † – en route to final mark; tt – time trial

Event	Time	Name	Club	Date	Meet	Location	Ref

50m freestyle	21.67	sf, AS	Shinri Shioura	Itoman Toshin	7 April 2019	Japanese Championships	Tokyo, Japan

100m freestyle	47.87	Katsumi Nakamura	Itoman Toshin	18 February 2018	Konami Open	Tokyo, Japan

200m freestyle	1:45.23	Kosuke Hagino	Japan	21 September 2014	Asian Games	Incheon, South Korea

400m freestyle	3:43.90	Kosuke Hagino	Toyo University	12 April 2014	Japanese Championships	Tokyo, Japan

800m freestyle	7:49.65	Takeshi Matsuda	Leopalace 21	19 Apr 2009	Japanese Championships	Hamamatsu, Japan

1500m freestyle	14:54.80	Kohei Yamamoto	Mizuno	20 June 2014	Japan Open	Tokyo, Japan

50m backstroke	24.24	AS	Junya Koga	Japan	2 Aug 2009	World Championships	Rome, Italy

100m backstroke	52.24	r	Ryosuke Irie	Kinki University	5 Sep 2009	Japanese University Championships	Kumamoto, Japan

200m backstroke	1:52.51	AS	Ryosuke Irie	Japan	31 Jul 2009	World Championships	Rome, Italy

50m breaststroke	26.94	AS	Yasuhiro Koseki	Japan	17 June 2018	Mare Nostrum	Monte Carlo, Monaco

100m breaststroke	58.78	AS	Yasuhiro Koseki	Japan	17 June 2018	Mare Nostrum	Monte Carlo, Monaco

200m breaststroke	2:06.67	WR	Ippei Watanabe	Waseda University	29 January 2017	Kosuke Kitajima Cup	Tokyo, Japan

50m butterfly	23.27	Kengo Ida	Self Defense Force	2 April 2019	Japanese Championships	Tokyo, Japan

100m butterfly	51.00	Kohei Kawamoto	Niigata	11 Sep 2009	Japanese National Sports Festival	Niigata, Japan

200m butterfly	1:52.97	AS	Takeshi Matsuda	Japan	13 Aug 2008	Olympic Games	Beijing, China

200m individual medley	1:55.07	AS	Kosuke Hagino	Toyo University	9 April 2016	Japanese Championships	Tokyo, Japan

400m individual medley	4:06.05	AS	Kosuke Hagino	Japan	6 August 2016	Olympic Games	Rio de Janeiro, Brazil

4×50m freestyle relay	1:28.69	(22.64)Makato Ito (21.59)Masayuki Kishida (22.26)Yoshinori Muramatsu (22.20)Katsumi Nakamura	Tokyo	16 September 2012	National Sports Festival	Gifu, Japan

4×100m freestyle relay	3:12.54	AS	(48.52)Katsumi Nakamura (48.19)Shinri Shioura (47.61)Katsuhiro Matsumoto (48.22)Juran Mizohata	Japan	11 August 2018	Pan Pacific Championships	Tokyo, Japan

4×200m freestyle relay	7:02.26	AS	(1:45.90)Sho Uchida (1:45.83)Yoshihiro Okumura (1:45.99)Shogo Hihara (1:44.54)Takeshi Matsuda	Japan	31 July 2009	World Championships	Rome, Italy

4×100m medley relay	3:30.03	(52.53)Ryosuke Irie (58.45)Yasuhiro Koseki (51.06)Yuki Kobori (47.99)Shinri Shioura	Japan	24 August 2018	Asian Games	Jakarta, Indonesia

Sentence(s)

Junya Koga set the Japanese records in the 50 m backstrokes at the 2009 Japan Championships.

final_sentence: Junya Koga set the Japanese records in the 50 m backstrokes at the 2009 Japan Championships.