Toshiaki Nishioka has five losses against four opponents on his boxing record. For a list of Nishioka's best fights, refer to "Best fights of Toshiaki Nishioka".
On October 13, 2012 Toshiaki Nishioka fought Nonito Donaire in a super-bantamweight world-title fight for the WBO and The Ring titles. Nishioka was 36 years old and with a record of 39-5-3 (24), and Donaire was 29 years old and with a record of 29-1 (18). Nishioka lost the fight via 9th-round TKO.
On March 6, 2004 Toshiaki Nishioka fought Veeraphol Sahaprom in a bantamweight world-title fight for Sahaprom's WBC title. Nishioka was 27 years old and with a record of 23-4-3 (14), and Sahaprom was 35 years old and with a record of 40-1-2 (27). Nishioka lost the fight via 12-round unanimous decision.
On June 25, 2000 Toshiaki Nishioka fought Veeraphol Sahaprom in a bantamweight world-title fight for Sahaprom's WBC title. Nishioka was 23 years old and with a record of 20-3-1 (12), and Sahaprom was 31 years old and with a record of 26-1 (19). Nishioka lost the fight via 12-round unanimous decision.
On December 16, 1995 Toshiaki Nishioka faced off against Momotarō Kitajima at age 19. He was coming in with a record of 6-2 (3). Nishioka lost the fight via 6-round majority decision.
On February 4, 1995 Toshiaki Nishioka faced off against Masahiko Nakamura at age 18. He was coming in with a record of 1-1 (1). Nishioka lost the fight via 4th-round KO.
