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.
* Bolded letters in the competitor's name, if any, indicate the surname/family name.
Yokoyama Kinzaburō
1922
Recognized as the first champion, possibly by defeating Takizawa Kichisuke on 22-05-07.
[…]
Takahashi Kazuo
1926
Kuba Kiyoshi
1927-06-05
Tōkyō
Recognized by Dai Nippon Kentōkai; still champion as of 28-11-04.
Suzuki Seiichi
1927
Tōkyō
Wins Meiji Shrine championship.
Satō Tōyō
1929-11-31
Tōkyō
Defeats Takahashi Eiji to win Meiji Shrine championship.
Hashimoto Shuku[19]
1930-04-19
Tōkyō
Dan Sacramento
1930-06-24
Tōkyō
Horiguchi Tsuneo
1933-05-23
Tōkyō
Defeats Nakamura Kaneo to become the Japanese representative for the Japan-vs-France competitions; also wins All Japan Championship, defeating Koike Sanekatsu on 34-12-26 in Tōkyō; vacant in 35(?).
Koike Sanekatsu
1936-01-05
Tōkyō
Defeats Takatsu Gorō for the All Japan Championship.
Gen Umio
1937-03-06
Tōkyō
Moves to USA in 37-09.
Horiguchi Tsuneo [3?]
1942?
May have continued to hold the title since 34-12-26.
Isamu Kongō
1942-07-03
Tōkyō
Still champion as of 42-11-20; Baby Gustillo and Kaidō Takeshi fight for the vacant title to a draw on 43-11-09.
Yūki Toshio
1944
Said to win the White Fighting Flag.
Baby Gustillo (Loret Gustillo)
1947-08-29
Tōkyō
Defeats Sakuma Tōsuke.
Gotō Hideo
1950-05-01
Ōsaka
Baby Gustillo [2]
1950-09-16
Kawaguchi, Saitama
Stripped of the title on 51-02-03 upon losing his bid for the lightweight title.
Gotō Hideo [2]
1951-10-01
Tōkyō
Defeats Tanaka Noboru; recognized by the Japan Boxing Commission upon its inception on 52-04-21.
