Les Durs à cuire (Comment supprimer son prochain sans perdre l'appétit)

Jean Poiret

Louis

Roger Pierre

Germain Lormond

Michel Serrault

Rossignol, private detective

Mireille Darc

Josette

Stéphane Audran

Rika Lormond

Claude Chabrol

Psychiatrist

Hubert Deschamps

Robert Darsac

Olivier Hussenot

Theater director

Max Montavon

Homosexual

France Rumilly

Raymonde

Fernand Sardou

Inspector

Marcel Achard

Self (uncredited)

Philippe Castelli

Critic (uncredited)

Jean Degrave

Prosecutor (uncredited)