Objective lens, optical pick-up device, and optical disk device

摘要

To provide an optical pickup device and optical disk device capable of realizing at least one of thickness reduction, size reduction and suppression against characteristic deterioration even where coping with various wavelengths of laser including a blue laser. An optical pickup device comprising light sources (81,101) for respectively emitting a plurality of different wavelengths of light, unit structured for causing at least a part of the light emitted from the light sources to pass a same optical path; and focusing unit for focusing the light. The focusing unit includes at least first and second focusing parts (32,33), the first focusing part being to focus mainly a wavelength of light different from a wavelength of light to be mainly focused by the second focusing part.