A lift frame supports a turntable unit, and moves between a lower-most position and a read/write position in conjunction with slide movement of a follower slider. The follower slider has a pressing member and a cam groove. Pressed to a bottom plate of a device chassis by a coil spring, the pressing member stabilizes the movement of the follower slider. The cam groove fits onto a lifting pin of the lift frame. At the read/write position, the cam bottom wall is constituted of a pin pushing portion. The pin pushing portion is pushed upward by the coil spring to press the lifting pin to a cam groove upper wall when the lift frame is in the read/write position.