PURPOSE: To decrease the number of parts and to miniaturize, the size of the above device by providing an oscillation base having a rotational driving mechanism for rotating a turn table and a position detecting mechanism for positioning and identifying a cassette.

CONSTITUTION: A plunger solenoid 67 is energized and a moving part 70 extends to push down the oscillation base 46 when the cassette 5 desired to be played is selected. A 2nd connecting rod 71 stops at the point of the time when the rod comes into contact with a reference pin 73 of the cassette 5 at this time, but a 1st connecting rod 69 still slides and, therefore, the cassette 5 of a deck 3 is brought into pressurized contact by a tension spring 72 and an opening/ closing frame 74 is opened by an opening/closing mechanism (not shown) provided in the deck 3 to put the cassette into the playable state. The plunger solenoid 67 is de-energized and the moving part 70 is pushed back when another cassette 5 is selected. The oscillation base 46 is then turned to the position where a reel rest 29 does not interfere with a magazine 32 and in succession, a motor 45 runs to select the next cassette 5.