Abstract: A motor drive device for a camera includes a planetary gear mechanism having a sun gear coupled to the driving side and a planet gear adapted to revolve around the sun gear in mesh with an internal gear coupled to the driven side. The revolution of the planet gear is interrupted at the time of film winding so that the planet gear serves as a relay gear between the driving side and the driven side. Once winding is completed, the planet gear begins revolving around the sun gear. The entire mechanism is stopped so that shutter release may be effected. When shutter release has been effected, the planet gear again revolves around the sun gear to the point where the revolution of the planet gear is again interrupted for film winding.