PURPOSE: To load a cassette while it is kept upright by using a matter which is revolved together with a cassette holder, a slide plate which supports freely rotatably the cassette holder and a rotor which transmits the revolving power to the slide plate and said matter to be revolved.

CONSTITUTION: A worm 11 is revolved with the revolution of a motor 10, then a worm wheel part 12a of a relay gear 12 is revolved counterclockwise. Then a drive gear 13 connected to a flat gear part 12c of a relay gear 12 is revolved clockwise by centering on a support shaft 13a. Here a driving lever 14 is turned clockwise by about 25° and therefore a main rotor 15 is turned counterclockwise by about 41° by centering on a support shaft 9a. As a result, a matter 16 to be turned and working in response to the rotor 15 is turned clockwise by about 105° by centering on a holder shaft 9d. Therefore, a cassette holder 4 which fixes the matter 16, a cassette lock lever 17 supported by the holder 4, a cassette 15, etc. are also turned clockwise by about 105° by centering on the shaft 9d. Thus the cassette 5 is set upright.