To contrive the constitution and arrangement of a detecting means for detecting film jamming in order to contribute to the miniaturization of a camera.

A pair of developing rollers 26 is constituted of a fixed roller 27 and a moving roller 28. Both ends of the roller 28 are movably supported by a pair of leaf springs 29. A film passing switch 34 is arranged behind one of the springs 29. The switch 34 detects the movement of the roller 28 and is turned on. When the switch 34 is kept in a state where it keeps ON output over the scheduled ejection time of instant film, it is judged as a state where the instant film is jammed at the roller 26 and the state is warned to a user. Since the switch 34 can be incorporated into the roller 26, the camera is miniaturized.