A case body containing instant photo films includes an exit slot for feeding out one instant photo film after another, and a claw path opening for allowing entry of a claw member ejecting the instant photo films. A pair of thrust preventing flaps is disposed inside the exit slot, for closing the lateral ends of the exit slot to prevent the instant photo film thrusting out. The claw path opening is closed by a light shielding plate and a light shielding skirt, which compose a light shielding member. The light shielding plate is moved to an open position by the claw member in the first advancing operation, and is moved to a full-open position in the second advancing operation.