Miyamoto started Karate training at the age of 4 and won multiple titles in the youth categories before transitioning to Hashimoto Dojo and begin a kickboxing career in 2008.
[3] After an amateur career of 22 wins, 2 defeats and 1 draw Miyamoto turned professional on January 31, 2010, at the MAJKF BREAK 1 event.
[6] On September 22, 2012, Miyamoto defeated Ryuya Kusakabe by unanimous decision at NJKF KICK TO THE FUTURE 6 to capture WBC Muay Thai Japan Super Bantamweight title.
[7] On September 27, 2015, Miyamoto defeated Alexis Barateau by second-round knockout for the WBC Muay Thai International Super Bantamweight title.
[9] Prior to the fight it was announced that Miyamoto's rematch against Yugo Kato at NO KICK NO LIFE on January 9, 2021, would be the last of his career.