Serge Reggiani

Joseph "Rouletabille"

Hélène Perdrière

Mathilde Stangerson

Lucien Nat

Robert Darzac

Michel Piccoli

Lebel

Gaston Modot

Mathieu

Marcel Herrand

Criminal Bellmayer alias Larsan

Loleh Bellon

Maid

Louis Bugette

Nurse from the hospital

Yvette Etiévant

Girl at the party at Rouletabille's

Jean Mercure

Investigating judge