Magnetic tape library device including cartridge exchange number restriction mechanism

A magnetic tape library device, comprising:

• a magazine which houses a magnetic tape cartridge inside thereof via a cell;
• a device main body which houses the magazine in a freely movable manner within a same plane along an inserting/extracting direction;
• and
• an accessor provided on one side of the device main body along the inserting/extracting direction, which transports the magnetic tape cartridge extracted from the magazine along the inserting/extracting direction and towards a magnetic tape drive, wherein:
• a plurality of the cells are provided inside the magazine in a plurality of rows along the inserting/extracting direction and on a plurality of stages in a height direction in a stacked manner;
• and
• a cartridge exchange number restricting mechanism is provided for restricting the magnetic tape cartridges from being ejected out from remaining cells except for the cell where at least a specific magnetic tape cartridge is housed out of the plurality of cells under a state where the magazine is being drawn out so that the plurality of cells on a front-side drawer end part in the inserting/extracting direction out of the plurality of cells are outside of the device main body.