Patent ID: 7648247

Claim:
A light source device, comprising: a lamp body including a light source lamp and a reflector, the reflector holding the light source lamp and including a reflection surface that reflects the light beam irradiated by the light source lamp; a lamp housing on which the lamp body is attached; and a plurality of projections protruding along an optical axis of the light beam irradiated by the light source lamp formed on the lamp housing, the reflector including: an opening, a periphery of the opening including an inner side and an outer side, the periphery of the opening having a stepped configuration of which a height gets taller from the inner side toward the outer side, and a positioning surface which is provided on a highest position of the outer side of the periphery of the opening of the reflector relative to the light source lamp, the positioning surface being shaped in a rectangular form and being abutted to the plurality of projections of the lamp housing in the optical axis direction, the plurality of projections being located to correspond to corners of the positioning surface.