There is provided a recording medium reproducer capable of surely reproducing information from a selected arbitrary recording medium even if a vibration acts on the recording medium mounted on an automobile during travel. A CD changer (1) comprises a disc containing section and a separation mechanism (7). The disc containing section comprises a moving chassis (18) and a holder (19) provided with a protrusion (29). The separation mechanism (7) comprises a rotary member (25), a moving member (26), and a cam member (24). The moving chassis (18) is attached to the moving member (26). is fixed with. The rotary member (25) and the moving member (26) are provided with a second wall (27). The cam member (24) can move freely along arrow K between the moving chassis (18) and the second wall (27) and has a guide groove (31) engaging with the protrusion (29). First and second separation grooves (39, 40) engaging with the protrusion (29) are formed between the moving chassis (18) and the cam member (24) and between the cam member (24) and the second wall (27).