Aberration compensating device and optical head device

It may be utilized to provide a simple structure more effectively correct astigmatism as the aberration correcting apparatus includes an optical head device and the aberration correction device. Aberration aberration correction means (2) comprises a liquid crystal layer (24), a liquid crystal panel the transparent electrodes (22A and 22B) (3), the correction light emitted through the objective lens (9) focused on the optical disc recording laser beam . Lens electrodes (22A and 22B) (30) is constituted by a peripheral portion of the substantially circular central portion (30) and around the central portion, while the peripheral portion to the central portion (30) is divided into eight substantially equal center angle of dividing the peripheral portion (31 to 38) configured. If the diameter of the liquid crystal panel and the objective lens (9) (3) corresponding to the diameter of the entrance pupil region (39) of the laser light is set to D1, the diameter of the central portion (30) is defined as D2, time D2 / D1 It is set in a range from 0.5 to 0.65.