Mizumoto was born in Ise on September 12, 1985. After graduating from Mie High School, he joined J1 League club JEF United Ichihara (later "JEF United Chiba") in 2004. He played many matches as center back. The club won the champions in the 2005 and 2006 J.League Cup. In 2008, he moved to Gamba Osaka. However he could not play many matches and he moved to Kyoto Sanga FC in June. He played as regular player in 3 seasons. The club was relegated to J2 League end of 2010 season. In 2011, he moved to Sanfrecce Hiroshima. The club won the champions in the 2012, 2013 and 2015 J1 League. Although he played as regular player until 2018, he could hardly play in the match in 2019. In August, he moved to Matsumoto Yamaga FC. In 2020, he moved to J2 club FC Machida Zelvia.