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)