An accountant by profession, Dehaine joined the National Assembly representing Oise after René Quentier's death on 18 November 1976.
He was defeated in 1981, but returned to his seat in 1986 following the death of Marcel Dassault.
He stayed in office until 2002, succeeded by Éric Woerth.
Dehaine also served as Mayor of Senlis from 1974 to 2008 after succeeding Jean Reymond.
This article about a Rally for the Republic politician is a stub.