OPTICAL PICKUP

PROBLEM TO BE SOLVED: To reduce a leakage magnetic field toward outside from an actuator part relating to an optical pickup. SOLUTION: A leakage magnetic field on a magnetic film of an optical magnetic disk (13) can largely be reduced by decreasing a vertical component of the leakage magnetic field, which is generated by actuator parts (50, 60) and tends toward an optical magnetic disk (13) via opening parts (52, 68), to the prescribed magnetic strength or lower on the magnetic film of the optical magnetic disk (13), therefore, the recording operation of a signal to the optical magnetic disk (13) according to a magnetic field modulation system can further be improved. In this case, the improvement is especially effective when it is applied to the actuator part (60) where a leakage magnetic field generated from a tracking servo magnet is larger than that generated from a focus servo magnet as a leakage magnetic field tending toward the optical magnetic disk (13) via the opening part (68).