Le commissaire Maigret
Cécile
Madame Boynet
Madame Petitot, la concierge
Nouchi
Lucas (as Gabriello)
Dandurand
Machepied
Gérard Pardon
Dr. Pierre
Le directeur de la P.J.
Le juge d'instruction (as Henri Bonvalet)
Monfils
Hélène Pardon (uncredited)
Monsieur Louis (uncredited)
Monsieur Paul (uncredited)
Un inspecteur (uncredited)
Léopold (uncredited)
Voyageur dans le métro (uncredited)
(uncredited)
L'amie de la concierge (uncredited)
Un gendarme (uncredited)
Le serrurier (uncredited)
Le médecin (uncredited)
La femme au tandem (uncredited)
L'homme au tandem (uncredited)
Le raccommodeur de faïence (uncredited)
Le garçon d'étage (uncredited)
Le chauffeur de taxi (uncredited)
Une amie de Madame Petiot (uncredited)
La femme de ménage (uncredited)
Un complice de Dandurand (uncredited)
Un inspecteur (uncredited)
Un inspecteur (uncredited)