Abstract: In an apparatus for tracking an optical disk, readiness in acquiring a steady tracking condition is significant. That is, if the light beam is subjected to feed back while it is positioned in a positive feed back region, e.g., in the middle of adjoining tracks, the track servo system causes an oscillation. Therefore, according to the present invention, the magnitudes of signals from two pits disposed offset from the track and a pit on the track are compared whereby position of the light beam is detected so that the tracking error signal may be cut off when the light beam is positioned in the middle of adjoining tracks.