Léon Ménard, a farmer and an apparently simple man of the country, is invited to visit his uncle Henri Ménard, a prosperous industrialist. He encounters a number of people scheming to marry into the Ménard family for the sake of money. Ménard discovers and thwart the plots and manages to unite a young couple who truly are in love. The romantic comedy ends happily with a double marriage. Henri's daughter Nicole marries Didier, and Ménard marries his new-found love Rosine. It turns out that Léon is "not so stupid" after all.
| Actor | Role |
|---|---|
 BourvilLéon Ménard | Léon Ménard |
 Suzy CarrierNicole, la cousine de Léon | Nicole, la cousine de Léon |
 Mona GoyaGaby Moreuil, l'actrice | Gaby Moreuil, l'actrice |
 Made SiaméLa mère Ménard | La mère Ménard |
 Albert DuvaleixFrançois | François |
 Bernard LancretDidier de Bellemont | Didier de Bellemont |
 Yvette AndréyorMademoiselle la gouvernante | Mademoiselle la gouvernante |
 Charles BouillaudJoseph | Joseph |
 Gaston MaugerMénard - le père de Léon | Ménard - le père de Léon |
 Paul FaivreMaître Perrot - le notaire | Maître Perrot - le notaire |
| JJacqueline BeyrotRosine | Rosine |
| FFrédéric MuniéNot listed | Not listed |
| LLéon DaubrelNot listed | Not listed |
| JJean GabertNot listed | Not listed |
 Yves DeniaudNot listed | Not listed |
 Jacques LouvignyNot listed | Not listed |
 Albert BroquinNot listed | Not listed |
| EEliane CharlesNot listed | Not listed |
| RRobert FretelNot listed | Not listed |
| NNaudèsNot listed | Not listed |