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.
Also holds the flyweight title; recognized by the Japan Boxing Commission upon its inception on 52-04-21; also wins the World Flyweight Title on 52-05-19; vacates Japanese flyweight title on 52-08-05 and bantamweight title on 52-08-25.
Horiguchi Hiroshi [3]
1952-09-23
Ōsaka
Defeats Nakanishi Kiyoaki; vacates on 54-07-27.
Komuro Keiichi
1954-09-27
Tōkyō
Defeats Sasaki Tamio.
Ōtsuka Masakazu
1955-04-19
Ōsaka
Komuro Keiichi [2]
1955-06-28
Tōkyō
Danny Kid (Florencio Solente)
1956-07-08
Tōkyō
Ōtaki Saburō
1956-08-20
Tōkyō
Ishibashi Kōji
1957-08-25
Tōkyō
Yamaguchi Tetsuya
1961-02-01
Tōkyō
Nagata Kōzō
1961-12-14
Tōkyō
Haga Katsuo
1963-07-05
Tōkyō
Takami Tatsuya
1964-03-19
Sendai
Haga Katsuo [2]
1964-07-10
Tōkyō
Yamagami Tetsuya
1965-06-10
Tōkyō
Saitō Katsuo
1966-04-08
Sendai
Ushiwakamaru Harada(Harada Katsuhiro)
1967-03-19
Tōkyō
Takagi Eigo
1967-09-14
Tōkyō
Ushiwakamaru Harada [2]
1968-10-24
Okayama
Uchiyama Shintarō
1969-11-26
Tōkyō
Ōki Shigeyoshi
1970-12-09
Tōkyō
Uchiyama Shintarō [2]
1971-02-10
Tōkyō
Kurosawa Genzō
1972-11-11
Wakayama
Uchiyama Shintarō [3]
1973-02-26
Tōkyō
Vacates in 74-09.
Numata Hisami
1974-12-01
Kōriyama, Fukushima
Defeats Watanuki Seiichi; fights to a draw but wins by total points.
Okabe Tsuyoshi
1977-01-29
Fukuoka
Numata Hisami [2]
1977-05-16
Sendai
Araki Joe
1978-08-25
Tōkyō
Anan Kōsei
1978-11-25
Tōkyō
Hurricane Teru (Terukina Shunzō)
1979-07-16
Tōkyō
Ishigaki Hitoshi
1980-01-28
Tōkyō
Hurricane Teru [2]
1980-05-03
Yamagata
Vacates on 81-10-05
Isogami Shūichi
1981-10-06
Tōkyō
Defeats Mitsui Hideharu.
Imazato Mitsuo
1983-04-28
Tōkyō
Nishimura Takaharu
1984-11-04
Tōkyō
Sugimoto Kōichi
1985-02-05
Ōsaka
Imazato Mitsuo [2]
1985-05-02
Tōkyō
Takahashi Naoto
1987-02-01
Tōkyō
Kobayashi Chiaki
1987-10-03
Tōkyō
Vacates on 87-11-05.
Shimabukuro Tadashi
1988-01-24
Tōkyō
Defeats Takahashi Naoto; vacates on next day.
Tanaka Koheita
1988-07-11
Tōkyō
Defeats Crusher Miura.
Shimamura Sōichi
1988-12-22
Tōkyō
Ozaki Keiichi
1989-03-20
Tōkyō
Crusher Miura(Miura Toshimi)
1989-06-12
Tōkyō
Okabe Shigeru
1990-02-17
Tōkyō
Tatsuyoshi Jōichirō
1990-09-11
Tōkyō
Vacates in 90-10.
Ozaki Keiichi [2]
1991-04-13
Tōkyō
Defeats Okabe Shigeru.
Yakushiji Yasuei
1991-06-30
Nagoya
Vacates on 91-12-02.
Yamaoka Masaki
1992-03-07
Tōkyō
Defeats Miyagi Seisaku.
Great Kanayama(Lee Dong-chun)
1992-06-06
Tōkyō
Kawamasu Setsuo (Segawa Setsuo)
1995-02-28
Tōkyō
Vacates on 96-12-06 due to injury suffered in an auto accident.
Matsushima Jirō
1997-03-25
Tōkyō
Defeats Arai Yasushi.
Yamato Shin
1998-01-27
Tōkyō
Vacates on 98-11-20.
Nishioka Toshiaki
1998-12-29
Ōsaka
Defeats Watanabe Jun-ichi; vacates on 99-12-19.
Naka Nobuaki
2000-03-04
Tōkyō
Defeats Odaka Eiichi; vacates on 02-11-30.
Sasha Bakhtine (Alexander Bakhtin)
2003-02-17
Tōkyō
Defeats Nukaga Yuji; vacates on 06-03-10 during his 3month suspension due to the arrest for physical assault on 06-02-26.
Ikehara Nobuto
2006-06-11
Ōsaka
Defeats Toriumi Jun; vacates on 06-07-24 to focus on challenging for the world title.
