| 摘要 |
PROBLEM TO BE SOLVED: To provide a light source device that is constituted so that light is prevented from being leaked and the measuring accuracy is prevented from being deteriorated by efficiently discharging heat. SOLUTION: The light source device 50 is constituted of a projecting light source 52, a reflector 60 having a reflecting surface 63 of a specified reflectance, a projecting optical system 56 and a light box main body, and the light box main body holds the reflector 60, the projecting light source 52 and the optical system 56 at a specified position on a projecting optical axis. It possesses a reflection preventive member 68 which is arranged adjacently to the reflector 60 and whose inner surface opposed to the projecting light source 52 is a reflection preventive surface at least at part of a light source side end surface of the light box main body.
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