Robert Lamoureux as Robert Langlois, law student

Fernand Ledoux as Fernand Langlois, father, professor

Gaby Morlay as Gabrielle Langlois, mother

Nicole Courcel as Catherine Liseray, young neighbor

Louis de Funès as Mr. Calomel, neighbor on the floor above

Gaston Modot as Street violinist

Madeleine Barbulée as Marie-Louise, first maid

Yolande Laffon as Madeleine Sautaupain, Mom's friend

Robert Rollis as Léon “Alibi”, friend of Robert

Sophie Sel as Student of Mr. Langlois

Dominique Davray as Neighborhood butcher

Françoise Hornez as Nicole

Judith Magre as Germaine, secretary

Alix Mahieux as Little Sylvie

Sophie Mallet as Maid

Jany Vallières as Second comrade

Albert Michel as Prompter at the performance

Claude Castaing as

René-Jean Chauffard as Neighbor of the building

René Fleur as Notary

Robert Le Béal as Amateur

Jacques Marin as Gaston, neighbor on the sixth floor, under the roofs

Jean Tissier as Maître Pillat, of the council of the bar association

Martine Cuhaciender as Little Sylvie (uncredited)

Léon Arvel as Parent (uncredited)

Charles Bayard as (uncredited)

Paul Bisciglia as Tenant on the sixth floor, under the roof (uncredited)

Christian Brocard as Comrade of Léon (uncredited)

Marcel Charvey as Man who separates from his wife (uncredited)

Yvonne Constant as (uncredited)

Henri Coutet as (uncredited)

Hubert Deschamps as Spectator who didn't have dinner (uncredited)

Édouard Francomme as Un voisin célibataire (uncredited)

Benoîte Labb as (uncredited)

Jean-Paul Le Chanois as Spectateur (« Je ne vous dit rien ») (uncredited)

Dominique Marcas as Henriette (uncredited)

Bernard Musson as Spectator came to criticize (uncredited)

Gaëtan Noël as (uncredited)

Laure Paillette as Spectator with the bulky hair (uncredited)

Francia Seguy as (uncredited)

Paul Villé as Uncle (uncredited)

André Wasley as (uncredited)

Fabien Loris as (uncredited)