A slider for the optical head easy to manufacture and having a high degree of freedom is to be provided as a slider for the optical head for recording and/or reproducing a recording medium using the proximity optical field. On a slider member 3, adapted for running on the recording medium in a state of being floated over or contacted with the recording medium, a catadioptric lens 7 is bonded to constitute a slider for the optical head 1. The slider member 3 and the catadioptric lens 7 are connected and optically unified to each other so that the numerical aperture NA of an optical system made up of the slider member 3 and the catadioptric lens 7 is not less than unity. Also, the plane of the focal point of the light incident for the side of the catadioptric lens 7 is designed to be on a recording medium facing surface of the slider member 3.