An optical disk drive is capable of reproducing data even when defects such as flaws or stains. A system controller (32) of an optical disk (10) drive reproduces data by setting the maximum speed in accordance with the type of an optical disk, an amount of side-to-side run-out, and the like. When reproduction of data becomes impracticable for reasons of meandering of a track, or the like, in the middle of reproduction of data, the rotational speed is decreased, and a retry is performed. However, when reproduction of data becomes impracticable for reasons of flaws or stains, the rotational speed is reversely increased, and a retry is performed.