He won a bronze medal at the 1932 Winter Olympics in Lake Placid, New York, in the 50 km.

In addition, he won a complete set of medals at FIS Nordic World Ski Championships.

In 1930, Rustadstuen won the 17 km cross-country event and earned a silver in the 50 km cross-country event while he earned a bronze in the Nordic combined in 1931.

Rustadstuen won the men's 18 km at the Holmenkollen ski festival in 1934 and 1935.

This biographical article relating to Norwegian cross-country skiing is a stub.