In an optical disk apparatus, a feed motor for moving an optical pickup in approximately the radial direction of a disk is provided on a base, such as unit mechanism mounting member, that pivotally moves about a supporting point together with the optical pickup and a disk motor, and on the base, the feed motor is disposed at an outer circumferential position of the optical disk or at a position near the supporting point, in the projection region of the optical disk in its chucked condition.