Jean-Paul Belmondo as Commissioner Jean Letellier

Charles Denner as Inspector Moissac

Adalberto Maria Merli as Pierre Valdeck / Minos

Rosy Varte as Germaine Doizon

Jean Martin as Divisional commissioner Sabin

Lea Massari as Norah Elmer

Jean-François Balmer as Julien Dallas, student

Catherine Morin as Hélène Grammont

Roland Dubillard as Psychologist

Henry Djanik as Police inspector

Germana Carnacina as Pamela Sweet

Giovanni Cianfriglia as Marcucci

Jacques Paoli as Self

Philippe Brigaud as Neighborhood commissioner

Roger Riffard as Watchman Eugène Merclin

Georges Riquier as Prefect

Jean-Louis Le Goff as Sub-prefect

Maurice Vallier as Guest who goes to the wrong door

Maurice Auzel as Inspector

Henri-Jacques Huet as Julio Cortes, Norah's lover

Jacques Rispal as 'Cacahuète'

Jean-Louis Fortuit as Police inspector

Gilberte Géniat as Germaine Doizon's concierge

Michel Berreur as Armed robber (uncredited)

Pierre Douglas as Radio journalist (uncredited)

André Valardy as Radio reporter (uncredited)

Albert Delpy as Sound engineer (uncredited)

Jacques Mathou as Tenant disturbed by Letellier (uncredited)