PURPOSE:To instal a cassette by only inserting the cassette into an inserting hole by providing a position detecting means for operating a driving means, when a frame body is moved by an inserting operation of the cassette and a position of an interlocked sliding body reaches a prescribed position. CONSTITUTION:In a state that a cassette has been inserted into a cassette frame body 13, a driving force of a motor is transferred to a sliding body 26, and transfer of the cassette is executed. This device is provided with a transfer system which holds exactly each component part in both ends of a transfer path by placing a transfer means by an elastic member in the middle of a gear train, and is free from damage caused by an overrun of a motor. Also, it becomes possible that the engagement with a driving means is released in the vicinity of an attaching and detaching position for operating manually the cassette, the cassette is inserted smoothly together with a moderate load by elastic force, and thereafter, an electric conduction to the motor is executed, and the driving system is started. In this way, the cassette can be transferred exactly to a prescribed position in the device body without causing malfunction.
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