- Country: Japan
- Genres: Drama
- Release: 1939-08-10
- Director: Mikio Naruse
- Writers: Yôjirô Ishizaka , Mikio Naruse
- Language: Japanese
- Stars: Takako Irie , Minoru Takada , Etchan , Sachiko Murase , Sōji Kiyokawa , Fusako Fujima , Teruko Kato
- Runtime: 67 min
- Awards: N/A
- AKA: Le coeur sincère (France, French Republic) , Magokoro , Sincerity , Sincerity , Sincerity (United Kingdom) , Magokoro (Japan) , Sinceridad (Spain) , Sincerity (United States of America)
- Plot: Two young girls, Nobiko and Tomiko, go to the same school. The less fortunate girl Nobiko is one of the top students, while the rich girl Tomiko is not. At one time Tomiko's father was quite fond of Nobuko's mother.
- IMDB:tt0031605
Sincerity Cast · · · ALL
Mikio Naruse
Director
Takako Irie
Tobiko Haseyama
Minoru Takada
Keikichi Asada
Sachiko Murase
Keikichi's wife
Etchan
Nobuko
Teruko Kato
Tomiko
Fusako Fujima
Grandmother
Sōji Kiyokawa
Iwata