Larochelle served as a city councillor and as a school board member in Lévis.
He ran as an Action libérale nationale candidate in the district of Lévis in the 1935 provincial election and won.
Larochelle joined Maurice Duplessis's Union Nationale and was re-elected in the 1936 election.
He resigned in 1948 to accept a seat in the Legislative Council of Quebec and represented the division of La Salle until his death.
This article about a Member of the National Assembly of Quebec from the Union Nationale is a stub.