Miyauchi was born in Tokyo Metropolis on November 26, 1959. After graduating from Teikyo High School, he joined Japan Soccer League club Furukawa Electric in 1978. Initially, he could not play in many games for injury. In 1982, the club won JSL Cup. From 1983, he played as regular player and the club won 1985/86 Japan Soccer League and 1986 JSL Cup. He was also selected Best Eleven in 1985/86 and 1986/87. In Asia, the club won 1986 Asian Club Championship. This is first Asian champions as Japanese club. He retired in 1988. He played 114 games and scored 6 goals in the league.