Robert Lamoureux

Robert Langlois, law student

Fernand Ledoux

Fernand Langlois, father, professor

Gaby Morlay

Gabrielle Langlois, mother

Nicole Courcel

Catherine Liseray, young neighbor

Louis de Funès

Mr. Calomel, neighbor on the floor above

Gaston Modot

Street violinist

Madeleine Barbulée

Marie-Louise, first maid

Yolande Laffon

Madeleine Sautaupain, Mom's friend

Robert Rollis

Léon “Alibi”, friend of Robert

Sophie Sel

Student of Mr. Langlois

Dominique Davray

Neighborhood butcher

Judith Magre

Germaine, secretary

Alix Mahieux

Little Sylvie

Sophie Mallet

Maid

Albert Michel

Prompter at the performance

René-Jean Chauffard

Neighbor of the building

Robert Le Béal

Amateur

Jacques Marin

Gaston, neighbor on the sixth floor, under the roofs

Jean Tissier

Maître Pillat, of the council of the bar association

Léon Arvel

Parent (uncredited)