Michel Simon

as Albert Ménard-Lacoste / Alain Ménard-Lacoste

Louis de Funès

as Emile, manvalet

Marguerite Pierry

as Madeleine Lacoste

François Guérin

as Pierre Lacoste

Laurence Badie

as Geneviève Lacoste

Claude Gensac

as Evelyne, chambermaid

Léon Walther

as Maître Denisot, notary

Pauline Carton

as Boss of the hotel

Marthe Salbel

as Marie, cook

Lana Marconi

as une prostituée, "la comtesse"

Michel Nastorg

as Mechanic

André Brunot

as Dr. Ogier

Georges Bever

as Taxi driver

Max Dejean

as Tavern boss

Marcel Pérès

as Commissioner Vincent

Jacqueline Gut

as Mercer

Jacques Derives

as Doctor from Roubaix

Marcel Mouloudji

as Singer

Marc Arian

as Mr. Valembray, department head (uncredited)

Louiguy

as Self (uncredited)

Christine Vall

as Maid (uncredited)

Sacha Guitry

as Self in the prologue / Narrator (uncredited)