PURPOSE:To suppress the occurrence of a vibration at the time of unloading by providing a means for releasing a cartridge holding means from its locking state in a 1st moving range of a slide plate. CONSTITUTION:Since, first of all, a guide roller 149 is separated from an engagement surface 1292 of a cam part 129 by moving the slide plate 99, ejecting force is given by an ejecting arm 145 by abutting of a guide roller 150 against a front surface 1531 of a cartridge 153. However, the cartridge 153 is still obstructed on its slant surface 1533 by guide rollers 85 and 86, so that it is held in a cartridge holder 65. When the slide plate 99 is further moved, a releasing arm 124 is engaged with a pin 69, and hence the pin 69 is released from its locking state with an engagement part 98 of an arm 80. When the locking state is released, arms 80 and 81 are turned by energizing force of springs 90 and 91, and the cartridge 153 is ejected from the holder 65 by the arm 145.
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