Abstract: A film sheath, holding a sheet film to constitute a sheet film unit, is formed from a plastic resin, and is provided with at least a tapered portion in an end fringe which is directed toward a leading end of a sliding lid when the sliding lid is moved back to a closed position in a sheet film pack containing a stack of such sheet film units, so as to provide a sufficiently large gap between two of the stacked sheet film units, for smooth thrusting of the sliding lid into between the two sheet film units. The film sheath also has a protuberance in a corner of an open end, as a stop member for stopping the sheet film from slipping out of the film sheath.

Abstract: A stopper piece of a regulating member is abutted against a receiving portion formed at a lever of a display mechanism. The stopper is biased in a regulating direction by the force of a torsion coil spring. A projecting piece is abutted against a lever of a releasing member so that the stopper piece can be kept at a position where the rotation of the lever is regulated. The lever of the releasing member is supported in such a manner to move back and forth freely, and is held at the position where the rotation of the lever is regulated before a film pack is set. A trigger plate is formed at the lever. When a pack main body is set at a final position, the trigger plate is pushed by a pack main body and move. When the trigger plate is moved, the lever pushes a lock lever so that the regulation of the lever's rotation by the stopper can be released.