Jean Richard

Commissioner Etienne Ledru

Nicole Courcel

Anne-Marie Ledrut

Sophie Daumier

Juliette Ledrut

Junie Astor

Mrs. Terrasse

René Clermont

Director of the lab

Bernard Dhéran

Dr. Chauvin

Jean Galland

Mr. Duquesne

Jacques Hilling

Taxi driver

François Patrice

Inspector Martin

Jacques Perrin

Philippe Ledrut

Annick Tanguy

Janine, maid

Yves Arcanel

Jean-Pierre Cassel

Duquenne's son

Michel Nastorg

Medical examiner

Yvon Sarray

Neighbor

Denise Grey

Mrs. Legrand, the mother-in-law

Noël Roquevert

Commissioner Reboux

René Berthier

(uncredited)

Lucien Camiret

(uncredited)

Dominique Marcas

Telephonist (uncredited)

Alain Nobis

"Fuit défendu" waiter (uncredited)

Georges Sellier

(uncredited)