A camera equipped with an accommodating chamber which constitutes a periphery including a film spool spindle and which accommodates a film cartridge having a recess at one longitudinal end thereof, includes: a protruding surface portion which is provided in the accommodating chamber, which enters the recess, and which has on the outer surface thereof on the side opposite to the film cartridge a step formed by a recessed portion recessed toward the film cartridge; and a gear member arranged in the recessed portion and adapted to be engaged with the spool spindle to rotate the spool spindle, whereby the dimension in the camera height direction (i.e., the dimension in the longitudinal direction of the film cartridge) is reduced.