PURPOSE: To extract optionally a cassette case, by holding a cassette reproducing means with a holding member, and moving up and down the holding member along a support to detect the holding member when it moves up or down by an extent of one stage of cassette.

CONSTITUTION: A stage number detecting means is provided to detect each position of a cassette tape with which a cassette deck is set into a cassette case by means of an elevator mechanism. That is, a flat gear 321 is set to a rotary shaft 315, and a flat gear 322 engages the gear 321. A switch cam wheel 323 turns with interlocking to the gear 322. A switch cam 324 is formed at an area on the circumference of the wheel 323, and a stage detecting switch 325 touches the cam 324. Therefore the cam 324 presses the switch 325 every turn of the wheel 323.