A solid central defender, Miyamoto made his international debut in June 2000 against Bolivia and was a regular starter in the last tournament on home soil, also captaining the side. Not blessed with exceptional height or speed, Miyamoto has nonetheless won well over 50 caps to date and has been a regular in the national team set-up since his initial breakthrough. He has spent his entire professional career with Gamba Osaka, where he has made more than 250 J-League appearances.