Patent ID: 8456777

Claim:
A storage medium exchanging device to discharge a movable cell, which is one of plural magazine cells for storing a storage medium inserted from a doorway, and to store the movable cell, comprising: a carrying part on which the movable cell is mounted; a wrong insertion preventing part which generates discharging force to make the carrying part discharge from a magazine and blocks at least a part of a non-doorway of the discharged movable cell; and a unit locking part which positions the carrying part within the magazine against the discharging force, wherein the wrong insertion preventing part includes: a flapper which is arranged so as to be movable rotationally: a flapper spring which urges the flapper against the non-doorway side; and a flapper opening and closing board to make the flapper evacuate from the non-doorway against force, which the flapper spring generates, when the carrying part is stored in the magazine, wherein the carrying part is discharged by the discharging force corresponding to spring force which the flapper spring generates when the flapper is evacuated from the non-doorway by the flapper opening and closing board.