Albert Préjean

Le commissaire Maigret

Santa Relli

Cécile

Germaine Kerjean

Madame Boynet

Luce Fabiole

Madame Petitot, la concierge

Liliane Maigné

Nouchi

André Gabriello

Lucas (as Gabriello)

Jean Brochard

Dandurand

Yves Deniaud

Machepied

André Reybaz

Gérard Pardon

Marcel Carpentier

Dr. Pierre

Marcel André

Le directeur de la P.J.

Henry Bonvallet

Le juge d'instruction (as Henri Bonvalet)

Charles Blavette

Monfils

France Asselin

Hélène Pardon (uncredited)

Paul Barge

Monsieur Louis (uncredited)

Jacques Beauvais

Monsieur Paul (uncredited)

Fernand Blot

Un inspecteur (uncredited)

Charles Camus

Léopold (uncredited)

Jean Clarieux

Voyageur dans le métro (uncredited)

Marius David

(uncredited)

Charlotte Ecard

L'amie de la concierge (uncredited)

Pierre Ferval

Un gendarme (uncredited)

Eugène Frouhins

Le serrurier (uncredited)

Gustave Gallet

Le médecin (uncredited)

Alice Gosset

La femme au tandem (uncredited)

Georges Gosset

L'homme au tandem (uncredited)

Charles Lavialle

Le raccommodeur de faïence (uncredited)

Jean Martin

Le garçon d'étage (uncredited)

Marcel Melrac

Le chauffeur de taxi (uncredited)

Geneviève Morel

Une amie de Madame Petiot (uncredited)

Julienne Paroli

La femme de ménage (uncredited)

Marcel Raine

Un complice de Dandurand (uncredited)

Maurice Salabert

Un inspecteur (uncredited)

Henri Vilbert

Un inspecteur (uncredited)