Belsvik was born on 14 April 1956 in Haugesund,[1] and grew up in Stord.

He has education in health care, and worked at a hospital in Kvinnherad until becoming a full-time writer in 1983.

[1] He made his literary debut in 1979 with the children's book Ingen drittunge lenger.

[2] He received the Norwegian Critics Prize for Children's Literature in 1996 for Dustefjerten og den store vårdagen, and again in 2001, for Verdens mest forelska par.

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