Jean-Paul Belmondo

Commissioner Jean Letellier

Charles Denner

Inspector Moissac

Adalberto Maria Merli

Pierre Valdeck / Minos

Rosy Varte

Germaine Doizon

Jean Martin

Divisional commissioner Sabin

Lea Massari

Norah Elmer

Jean-François Balmer

Julien Dallas, student

Catherine Morin

Hélène Grammont

Roland Dubillard

Psychologist

Henry Djanik

Police inspector

Germana Carnacina

Pamela Sweet

Giovanni Cianfriglia

Marcucci

Jacques Paoli

Self

Philippe Brigaud

Neighborhood commissioner

Roger Riffard

Watchman Eugène Merclin

Georges Riquier

Prefect

Jean-Louis Le Goff

Sub-prefect

Maurice Vallier

Guest who goes to the wrong door

Maurice Auzel

Inspector

Henri-Jacques Huet

Julio Cortes, Norah's lover

Jacques Rispal

'Cacahuète'

Jean-Louis Fortuit

Police inspector

Gilberte Géniat

Germaine Doizon's concierge

Michel Berreur

Armed robber (uncredited)

Pierre Douglas

Radio journalist (uncredited)

André Valardy

Radio reporter (uncredited)

Albert Delpy

Sound engineer (uncredited)

Jacques Mathou

Tenant disturbed by Letellier (uncredited)