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.
Kameda Akio defeats Tsukada Kei on 85-10-27 to be recognized as the champion by IBF Japan but vacates the title in 86.
Tabata Nobuyuki
1986-02-06
Tōkyō
Ozaki Fujio [2]
1986-06-05
Tōkyō
Vacates in 87.
Sakamoto Takao
1987-10-03
Sendai
Defeats MizoguchiYoshinori.
Yoshino Hiroyuki
1988-03-21
Tōkyō
Vacates on 92-12-21.
Satō Jintoku (Satō Masanori)
1993-02-10
Tōkyō
Defeats Ōhigashi Akira; vacates on 96-11-24 upon retirement.
Horiuchi Minoru
1997-01-13
Tōkyō
Defeats Nakahara Makoto.
Nakahara Makoto
1997-05-12
Tōkyō
Kayama Toshiharu
1998-06-23
Tōkyō
Nakano Yoshio
2000-12-05
Tōkyō
Nagase Teruo
2001-03-19
Tōkyō
Kobayashi Shūichi
2003-03-10
Tōkyō
Maeda Hiroyuki
2004-04-17
Interim champion since defeating Aihara Kazutaka on 03-12-20; defeats Kobayashi on 04-04-17 to become the undisputed champion; vacates on 04-10-18 upon moving up to the super welterweight class.
Yuba Tadashi
2005-01-16
Miyazaki
Ōmagari Teruyoshi
2005-09-23
Yokohama
Vacates on 07-01-24 due to ophthalmoplegia.
Yuba Tadashi [2]
2007-04-20
Tōkyō
Defeats Furukawa Akihiro.
Numata Kōji
2008-04-20
Miyazaki
Nakagawa Daisuke
2009-02-09
Tōkyō
Vacates on 10-08-03 due to the broken costal cartilage.
Wins OBPF and Japanese titles; vacates Japanese title on 12-11-14.
Takayama Suyon (Kim Su-yeon)
2012-12-21
Tōkyō
Defeats Saitō Kōshinmaru; vacates on 15-11-10.
Shindō Nobuyuki
2016-01-20
Tōkyō
Defeats Ōkawa Yasuhiro.
Arikawa Toshio
2016-04-28
Tōkyō
Yada Ryōta
2018-04-16
Tōkyō
Nagano Yūki
2019-04-21
Ōsaka
Obara Keita
2020-02-01
Tōkyō
His title defense on 22-04-12 is cancelled due to injury; Kobata Takeru defeats Nagano Yūki on 22-06-13 to become the interim champion; Obara defeats Kobata on 22-10-11; vacates on 22-12-16.
