 Robert LamoureuxRobert Langlois, law student | Robert Langlois, law student |
 Fernand LedouxFernand Langlois, father, professor | Fernand Langlois, father, professor |
 Gaby MorlayGabrielle Langlois, mother | Gabrielle Langlois, mother |
 Nicole CourcelCatherine Liseray, young neighbor | Catherine Liseray, young neighbor |
 Louis de FunèsMr. Calomel, neighbor on the floor above | Mr. Calomel, neighbor on the floor above |
 Gaston ModotStreet violinist | Street violinist |
 Madeleine BarbuléeMarie-Louise, first maid | Marie-Louise, first maid |
 Yolande LaffonMadeleine Sautaupain, Mom's friend | Madeleine Sautaupain, Mom's friend |
 Robert RollisLéon “Alibi”, friend of Robert | Léon “Alibi”, friend of Robert |
 Sophie SelStudent of Mr. Langlois | Student of Mr. Langlois |
 Dominique DavrayNeighborhood butcher | Neighborhood butcher |
| FFrançoise HornezNicole | Nicole |
 Judith MagreGermaine, secretary | Germaine, secretary |
 Alix MahieuxLittle Sylvie | Little Sylvie |
 Sophie MalletMaid | Maid |
| JJany VallièresSecond comrade | Second comrade |
 Albert MichelPrompter at the performance | Prompter at the performance |
| CClaude CastaingNot listed | Not listed |
 René-Jean ChauffardNeighbor of the building | Neighbor of the building |
| RRené FleurNotary | Notary |
 Robert Le BéalAmateur | Amateur |
 Jacques MarinGaston, neighbor on the sixth floor, under the roofs | Gaston, neighbor on the sixth floor, under the roofs |
 Jean TissierMaître Pillat, of the council of the bar association | Maître Pillat, of the council of the bar association |
| MMartine CuhacienderLittle Sylvie (uncredited) | Little Sylvie (uncredited) |
 Léon ArvelParent (uncredited) | Parent (uncredited) |
 Charles Bayard(uncredited) | (uncredited) |
 Paul BiscigliaTenant on the sixth floor, under the roof (uncredited) | Tenant on the sixth floor, under the roof (uncredited) |
 Christian BrocardComrade of Léon (uncredited) | Comrade of Léon (uncredited) |
 Marcel CharveyMan who separates from his wife (uncredited) | Man who separates from his wife (uncredited) |
| YYvonne Constant(uncredited) | (uncredited) |
