Leppanen played his entire career Tappara and won two Finnish championships and a total of six medals.
He played the championship series and leagues 328 matches. In periods 1964 and in 1978 Leppanen, who Tappara in each game.
The national team Leppänen played 98 A-caps. at the World Cup he played three times in 1973, 1974 and 1975.
In addition, he played the 1976 Innsbruck Winter Olympics as well as the Canada Cup.