Léonard Monestier owns a large fortune, alas his wife Cynthia made a bad investment in a worthless oil concession. Far from letting this get him down, Léonard decides to find a sucker to buy this concession from him. Right on cue appears Antoine Brévin, a befuddled billionaire who is very interested in Léonard's beautiful daughter Patricia and would do anything to win her hand...
| Actor | Role |
|---|---|
 Louis de FunèsLéonard Monestier | Léonard Monestier |
 Mireille DarcPatricia Monestier | Patricia Monestier |
 Roger DumasPaul Monestier | Paul Monestier |
 Jacqueline MaillanCynthia Monestier, la femme de Léonard | Cynthia Monestier, la femme de Léonard |
 Daniel CeccaldiPedro Castelli | Pedro Castelli |
 Christian MarinCharles | Charles |
 Guy TréjeanAntoine Brévin | Antoine Brévin |
 Philippe NicaudSimon Guilbaud | Simon Guilbaud |
 María Rosa RodríguezPalma Diamantino | Palma Diamantino |
 Yves BarsacqMario, un valet de Brévin | Mario, un valet de Brévin |
 Philippe DumatMonsieur Morrison | Monsieur Morrison |
 Jean GiraultNot listed | Not listed |
| JJacques VilfridNot listed | Not listed |