To prevent trouble such that a cartridge chamber cover closed again is locked and is not opened from occurring even when inadvertently opening the cartridge chamber cover in the midst of VEI processing.

When all the photographic film 6 is rewound into a cartridge body 20, a film detection switch 60 is turned off and the VEI processing is started, then a spool driving member 31 is continuously rotated in a rewinding direction. In the case a pin 73 exists at inclination parts 77c and 77d proximate to a recess 77b when force is exerted in the opening direction on an operation member 15, an edge part 58a is disengaged from a gap between a lock lever body 40a and a locking arm 44, and the locking of a lock lever 40 is released. In such a case, the cartridge chamber cover 8 is opened and a cover switch is turned off, but the rotation of a cam member 75 is continued while a cam switch 80 is turned on. After the switch 80 is turned off and the display board of a film cartridge 4 is moved to a position where it faces to a display aperture where photographing is being performed or photographing has been performed, a feeding motor 33 is stopped.