Optical head device and an optical information apparatus

The optical head device includes a light source, an objective lens, a hologram element, and a light detector, the hologram element includes a shielding region, a plurality of diffraction regions, a plurality of diffraction regions formed around the shielding region two of the first diffraction area and two second diffraction region, a third diffraction area formed so as to be arranged on either side of the two second diffraction area along the direction corresponding to the track vertical direction and is and a fourth diffraction region, the first to fourth two fifth formed so as to be arranged on either side of the area formed by the diffraction region along the direction corresponding to the track extending direction diffractive region and two wherein a sixth diffraction regions of the light detector 4 and the light receiving region, divided into four light receiving regions with respect to the three formed apart in a direction corresponding to the track extending direction first with four light receiving regions and light receiving regions, with respect to the four light-receiving regions And a three second light receiving region formed apart in the direction corresponding to the rack vertical direction.