In 1972, the club won the champions in Japan Soccer League and Emperor's Cup.
He scored many goals in early 1970s and competed with Kunishige Kamamoto for top scorer.
He played 176 games and scored 82 goals in the league and became a top scorer in 1972 and 1973.
In May 1973, Matsunaga was selected Japan national team for 1974 World Cup qualification.
This biographical article related to a Japanese association football forward is a stub.