OPTICAL PICK-UP UNIT AND OPTICAL PICK-UP USED IN THE OPTICAL PICK-UP UNIT

An optical pick-up unit includes an optical pick-up for recording reproducing data to and from the optical disc, the optical pick-up being provided on a base frame so that the optical pick-up can move in a predetermined radial direction of the loaded optical disc; a stepping motor provided on the base frame; a lead screw rotated by the stepping motor and provided in parallel with the moving direction of the optical pick-up; first and second guide rods arranged on the base frame in parallel with the lead screw through a predetermined spacing there between for guiding an optical pick-up base of the optical pick-up in the moving direction of the pick-up; a rack spring having one end which is fixedly mounted on the pick-up base by a screw and the other end which is provided with an engaging portion which is in engagement with a groove of the lead screw so as to move the pick-up base in the moving direction of the pick-up in accordance with the rotation of the lead screw; and an abutment portion provided on the pick-up base so as to abut on the second guide rod, wherein the rack spring is configured so as to forcedly rotate the pick-up base about the first guide rod with its reaction force so that the abutment portion of the pick-up base abuts on the second guide rod with a predetermined load.