Throughout Nilsson's career as an actor, he primarily worked at the Gothenburg City Theatre, but also other theatres around the country including the Uppsala City Theatre and the
Helsingborg City Theatre. He made his film debut in
Blånande hav (1956). While he was not a prolific film actor, he appeared in feature films such as
The Hunters from 1996 and
Dalecarlians from 2004, where he had minor roles that received positive acclaim. As a television actor, he appeared in the long-running TV series
Hem till byn, where he played the role of Harald Eriksson from 1973 to 2006. He played the police inspector Bo Kronborg, one of the main roles in the
comedy-drama television series
Polisen i Strömstad throughout the run of the series. As an artist, he exhibited together with his brother Rolf and Eric Ståhl. ==Personal life==