| 摘要 |
An optical pickup device is provided. In an optical pickup device, a light receiving element has light receiving regions for focusing as part of the plurality of light receiving regions. A diffraction element has diffraction regions for focusing as part of the plurality of diffraction regions. A part of division lines which define the diffraction region for focusing is formed in a shape which is convex from the outer side toward the inner side with respect to the center of the incidence range on the diffraction element where a returning light beam enters. The part of the division lines formed in the shape which is convex from the outer side toward the inner side divides an incidence range on the diffraction element where a returning light beam enters, regardless of whether or not there is a focus error.
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