Rotation number control device for disk signal reproduction apparatus

A rotation number control device for a disk signal reproduction apparatus that reproduces information using a disk on which the information is recorded along a spiral track, such as an optical disk or a magnetic disk. The rotation number control device includes a drive unit which rotates a disk, a rotation number detection unit which detects the rotation number of the disk, a rotation number control unit which controls the rotation number of the disk rotated by the drive unit, a vibration detection unit which detects vibration due to rotation of the disk, and a rotation number storage unit which, for each disk, stores a rotation number of the disk at a time when maximum vibration in a disk allowable vibration range is produced during rotational acceleration of the disk, as a maximum allowable rotation number. The rotation number of the disk is controlled so as not to exceed the maximum allowable rotation number of the disk which is stored in the rotation number storage unit.