An improved actuator for an optical pickup apparatus which is capable of increasing the efficiency of a focusing coil and tracking coil by arranging the focusing coil and tracking coil in the same plane and disposing more than at least one permanent magnet in order for a plurality of poles to be alternately generated thereby, for thus improving an operation efficiency of an optical pickup apparatus for a high density optical disc which has been made to be operated at a high speed. The actuator includes a bobbin including an objective lens, back yokes disposed at both sides of the bobbin, a plurality of permanent magnets arranged in one side of each back yoke in order for the poles thereof to be differently and alternately formed, and a plurality of tracking coils and focusing coils arranged in a portion of the permanent magnets of the bobbin.