Following the name of the champion(s): Indicates the number of times the competitor has held that title at that point.
[...]
Indicates a gap in the listing where title changes are not known.
<
Title was held or changed hands no later than this. In these cases, it is known that a competitor held the title at a certain time but not when he/she won it.
@
Order uncertain. Different titleholders may be known for the same year, for example, but it is not known who held the title before whom.
#
Unofficial or disputable claims. These are usually matches that certainly took place, but where there is doubt that the competitor shown should be recognized as a true title holder. These listings are also italicized.
Japan Boxing Commission
Japanese Flyweight Title (as of 2025-08-21)
* Recognized by JBC from 1952-04.
* Bolded letters in the competitor's name, if any, indicate the surname/family name.
Hanada Yōichirō
1934-12-25
Tōkyō
Defeats Itō Isamu in the All Japan championship; title most likely inactive during the 2nd Sino-Japanese War/WWII; Hanada again defends the title on 47-09-01.
Shirai Yoshio
1949-01-28
Tōkyō
Also wins the bantamweight title on 49-12-15; recognized by the Japan Boxing Commission upon its inception on 52-04-21; becomes the first Japanese to win the World Title on 52-05-19; vacates Japanese flyweight title on 52-08-05 and bantamweight title on 52-08-25.
Speedy Akira (Hayashi Akira)
1952-10-25
Nagoya
Defeats Kushida Noboru.
Misako Hitoshi
1955-01-06
Tōkyō
Wins OBF Title on 55-03-09; vacates Japanese title on 55-03-12.
Speedy Akira [2]
1955-04-13
Tōkyō
Defeats Yamaguchi Takeshi.
Ōkami Mitsutada
1955-10-15
Tōkyō
Speedy Akira [3]
1956-01-09
Tōkyō
Iwamoto Masaji
1956-04-19
Tōkyō
Yaoita Sadao
1958-01-07
Tōkyō
Also wins OBF Title on 58-09-11; vacates Japanese title on 58-12-29.
Vacates on 67-05-27 due to the retinal detachment.
Speedy Hayase(Hayase Hiroshi)
1967-08-28
Sapporo
Defeats Takayama Katsuyoshi.
Matsumoto Yoshiaki
1968-02-26
Tōkyō
Speedy Hayase [2]
1968-06-03
Tōkyō
Hanagata Susumu
1969-04-07
Tōkyō
Haba Osamu
1972-07-03
Yokohama
Hanagata Susumu [2]
1972-10-06
Yokohama
Loses his bid for the world title on 73-10-27; vacates Japanese title in 74-02.
Takada Jirō
1974-04-13
Naha
Defeats Shimabukuro Takenobu; vacates in 75-03; wins OBF Title 75-03-17.
Katō Kenji
1975-10-25
Nagoya
Defeats Haba Osamu.
Igarashi Chikara
1976-02-13
Tōkyō
Katō Kenji [2]
1977-06-27
Tōkyō
Maki Kōichi
1978-03-27
Tōkyō
Tamaki Kazumasa
1980-01-10
Tōkyō
Fuji Masaru
1982-04-21
Tōkyō
Funaki Kazuyoshi
1982-06-24
Tōkyō
Hozumi Shūichi
1982-11-15
Tōkyō
Vacates in 85-12 to focus on challenging for the world title.
Nishikawa Kōji
1986-01-23
Tōkyō
Defeats Uchikoshi Yoshiyuki; Matsuda Toshihiko is said to be recognized by IBF in 86 but the version is retired in 87.
Leopard Tamakuma (Tamakuma Yukito)
1987-02-26
Tōkyō
Vacant on 88-09-05.
Taihō Kenbun
1988-11-13
Ōsaka
Defeats Sakurai Yasutaka; vacates on 89-08-31 to challenge for WBA world title.
Matsuoka Yōsuke
1989-12-17
Ichinoseki, Iwate
Defeats Sasaki Osamu.
Puma Toguchi (Toguchi Takato)
1990-03-19
Tōkyō
Stripped of the title in 91-03.
Yuri Ebihara (Yuri Arbachakov)
1991-07-15
Tōkyō
Defeats Mizuno Takahiro; vacates on 91-12-02.
Tamura Tomonori
1992-02-02
Hōfu, Yamaguchi
Vacates in 92 (sometime after 92-07-20).
Kobayashi Hiroshi
1992-12-21
Tōkyō
Defeats Nitta Shōsei.
Shindō Futoshi
1993-03-22
Tōkyō
Okada Akihiro
1994-01-17
Tōkyō
Puma Toguchi [2]
1995-01-23
Tōkyō
Vacant on 96-10-08.
Suzuki Cabato (Nolito Cabato)
1996-11-18
Tōkyō
Defeats Shigeyasu Eiji.
Celes Kobayashi(Kobayashi Shōji)
1998-09-30
Tōkyō
Loses his bid for WBC world title on 2000-08-20; vacates Japanese title on 00-12-20.
Sakata Takefumi
2001-04-09
Tōkyō
Defeats Kawabata Masaki.
Trash Nakanuma(Nakanuma Masaki)
2002-04-30
Tōkyō
Sakata Takefumi [2]
2003-04-05
Tōkyō
Vacates in 03-12.
Nakano Hiroshi
2004-02-08
Gifu, Gifu
Defeats Koyama Kōji.
Naitō Daisuke
2004-06-06
Nagoya
Also wins OPBF Title on 06-06-27 but vacates it on 07-01-10; vacates Japanese title on 07-04-25.
Yoshida Kenji
2007-04-25
Interim champion since defeating Kudaka Hiroyuki on 07-04-01; status promoted.
Shimizu Tomonobu
2008-04-14
Tōkyō
Vacates on 10-11-08 to focus on challenging for the world title.
Igarashi Toshiyuki
2011-02-05
Tōkyō
Defeats Kobayashi Takayasu; vacates after winning the contendership for WBC world title on 11-11-06.
Kogawa Takuya
2012-01-26
Tōkyō
Defeats Ikehara Shigetaka.
Muranaka Suguru
2013-12-10
Tōkyō
Stripped of the title on 15-04-07 due to exceeding the weight limit for the title defense against Hayashi Tetsuya on 15-04-08; title remains vacant when Muranaka defeats Hayashi.
Kogawa Takuya [2]
2015-07-17
Tōkyō
Defeats Saitō Hiroki.
Kuroda Masayuki
2017-06-13
Tōkyō
Interim champion since defeating Yūta Matsuo on 17-02-28; defeats Kogawa to become the undisputed champion; vacates on 18-12-14 to focus on challenging for the world title.
Nakatani Junto
2019-02-02
Tōkyō
Defeats Mochizuki Naoki; vacates on 19-07-23.
Yuri Akui Seigo
2019-10-27
Asakuchi, Okayama
Defeats Kosaka Shun; vacates on 23-01-10 in order to focus on winning the world title.
