Kadro (34)
Albert PréjeanLe commissaire MaigretSanta RelliCécile
Germaine KerjeanMadame Boynet
Luce FabioleMadame Petitot, la conciergeLiliane MaignéNouchi
André GabrielloLucas (as Gabriello)
Jean BrochardDandurand
Yves DeniaudMachepied
André ReybazGérard PardonMarcel CarpentierDr. Pierre
Marcel AndréLe directeur de la P.J.Henry BonvalletLe juge d'instruction (as Henri Bonvalet)
Charles BlavetteMonfils
France AsselinHélène Pardon (uncredited)
Paul BargeMonsieur Louis (uncredited)Jacques BeauvaisMonsieur Paul (uncredited)Fernand BlotUn inspecteur (uncredited)Charles CamusLéopold (uncredited)
Jean ClarieuxVoyageur dans le métro (uncredited)Marius David(uncredited)Charlotte EcardL'amie de la concierge (uncredited)Pierre FervalUn gendarme (uncredited)Eugène FrouhinsLe serrurier (uncredited)
Gustave GalletLe médecin (uncredited)Alice GossetLa femme au tandem (uncredited)Georges GossetL'homme au tandem (uncredited)Charles LavialleLe raccommodeur de faïence (uncredited)
Jean MartinLe garçon d'étage (uncredited)Marcel MelracLe chauffeur de taxi (uncredited)Geneviève MorelUne amie de Madame Petiot (uncredited)Julienne ParoliLa femme de ménage (uncredited)Marcel RaineUn complice de Dandurand (uncredited)Maurice SalabertUn inspecteur (uncredited)
Henri VilbertUn inspecteur (uncredited)