Abstract: A driving mechanism for an optical pickup for optical disks which uses the 3-beam system for tracking error detection. The driving mechanism has a swing supporting point provided on a base, and a swing arm which pivots about the swing supporting point and fixedly holds an optical pickup. The swing arm has a flat portion provided near an end portion thereof. The flat portion contains the center axis of the swing arm. A correcting point is provide on the center axis of the swing arm. The driving mechanism further has a correcting mechanism for causing the correcting point to move along a circular arc having a radius smaller than the distance from the correcting point to the swing supporting point, and a swing arm driving mechanism for swingingly driving the swing arm. The driving mechanism is less costly and capable of driving the optical pickup at high speed and with high accuracy. In addition, degradation of the output signal can be prevented.