Provided is an optical pickup device whose optical axis adjustment can be
performed while an increase in cost is suppressed and whose optical axis
correction can be accurately performed even when a variation in
arrangement between laser elements occurs. The optical pickup device
includes a semiconductor 101 that houses at least three laser elements
having at least three different emission wavelengths in a single package,
and first and second diffraction gratings 102 and 111 for substantially
matching optical axes of lasers emitted from the laser elements with the
optical axis of the reference laser beam by a diffraction effect. The
first diffraction grating 102 matches an optical axis of a laser beam for
CD (780 nm in wavelength) with the reference optical axis by a
diffraction effect. The second diffraction grating 111 matches an optical
axis of a laser beam for DVD (655 nm in wavelength) with the reference
optical axis by a diffraction effect. Even when a variation occurs in a
light emitting point gap between the laser elements, by performing fine
adjustment of the corresponding diffraction grating in the reference
optical axis direction, the optical axis of the laser beam can be
adjusted.