A semiconductor laser element and a protective wall surrounding the element are
provided on the surface of a metal frame of a semiconductor laser device. Circumferential
portions are provided on an outer periphery of the metal frame for rotating the
optical axis of light originating from a light-emitting point of the semiconductor
laser element to a direction along the surface of the metal frame. By way of a
guide of an optical pickup base corresponding to the circumferential portions,
the semiconductor laser device is mounted on the optical pickup base.
