An optical disk apparatus includes a movable part having an objective lens for focusing a laser beam onto an optical disk. A lens-holding member holds the objective lens. A protecting member prevents contact of the objective lens with the optical disk. The protecting member is spaced apart from the optical disk. An elastic supporting member supports the movable part, and an actuator drives the movable part toward or away from the optical disk. The apparatus is constructed so as to maintain the protecting member spaced apart from the optical disk, even when the elastic supporting member is bent by gravity toward the optical disk.