How many movies have Jean Lefebvre and Michel Serrault acted in together?

They have worked on 13 movies together! Their first movie together was Diabolique (1955) and was their highest rated movie together. They have not worked together since Comiques de toujours (Vol. 1 à 4) (2009). They are most known for their comedy films together.

Role
Eugène Ballanchon, scientific researcher, single
Role
Mr. Granger, director of the scientific laboratory