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...
Louis de Funès
as Léonard Monestier
Mireille Darc
as Patricia Monestier
Roger Dumas
as Paul Monestier
Jacqueline Maillan
as Cynthia Monestier, la femme de Léonard
Daniel Ceccaldi
as Pedro Castelli
Christian Marin
as Charles
Guy Tréjean
as Antoine Brévin
Philippe Nicaud
as Simon Guilbaud
María Rosa Rodríguez
as Palma Diamantino
Yves Barsacq
as Mario, un valet de Brévin
Philippe Dumat
as Monsieur Morrison
