A semiconductor laser unit includes a plurality of semiconductor laser elements
arranged parallel with one another in a laser beam-emitting direction, and a base
for positioning and fixing the plurality of semiconductor laser elements. The plurality
of semiconductor laser elements are arranged such that a laser beam emitted from
the semiconductor laser element greatest in astigmatism, of the plurality of semiconductor
laser elements, is coincident in its axis with a reference axis of the base. In
the case that the semiconductor laser unit is arranged on an optical head device,
the focusing characteristic on the plurality of laser beams can be improved.
