A recording medium changer includes a storage block that is movable in a longitudinal direction, a drive block that processes data recorded on a recording medium, a conveying block that is movable in a vertical direction and conveys the recording medium for mounting onto the drive block or for storage into the storage block, and a power supply block that supplies drive power to individual sections. The rear position of the storage block is present above the drive block, the driving delivery position of the conveying block is present forward of the drive block, the conveying block is present in the driving delivery position at the time of movement of the storage block in the longitudinal direction, and the storage block is present in the forward position when storage and ejection of the recording medium into and from the storage block are performed via an opening.