Patent ID: 7152982

Claim:
An optical component casing with an illumination optical axis of light beam irradiated by a light source being set therein, in which a plurality of optical components are housed and arranged at predetermined positions on the illumination optical axis, the optical component casing comprising: a casing body having a plurality of holes penetrating toward the inside thereof, in which the plurality of optical components are housed and arranged therein; and a plurality of positioning members for positioning the plurality of optical components at the predetermined positions in the casing body, wherein the plurality of positioning members are inserted to the plurality of holes to abut on the optical components so that the plurality of optical components are positioned at the predetermined positions on the illumination optical axis of the light beam irradiated by the light source, wherein the plurality of positioning members include a parallel arrangement positioning member that abuts on the optical component arranged along an inner side of the casing body to position the optical component at the predetermined position on the illumination optical axis of the light beam irradiated by the light source, and wherein the parallel arrangement positioning member has a plurality of pins inserted into the plurality of holes to abut on the optical component.