Jean Brochard
as Plantiveau, the groundsman
Michel Serrault
as Mr. Raimond, teacher
Charles Vanel
as Alfred Fichet, private detective
Vera Clouzot
as Christina Delassalle
Georges Poujouly
as Soudieu, a schoolboy
Simone Signoret
as Nicole Horner
Paul Meurisse
as Michel Delasalle
Noel Roquebert
as M. Herboux
Thérèse Dorny
as Mme. Herboux
Pierre Larquey
as Mr. Drain, a teacher
Yves Marie Maurin
as Moinet, une jeune Moynet
Jean Temerson
as Le garçon d'hôtel
Georges Chamarat
as Dr. Loisy
Jacques Varennes
as Professor Bridoux
Roberto Rodrigo
as Le petit Jose (uncredited)
Jean-Pierre Bonnefous
as Le jeune De Gascuel (uncredited)
Michel Dumur
as Le jeune Ritberger (uncredited)
Henri Humbert
as Patard, le jeune Patard (uncredited)