Patent ID: 7344257

Claim:
A light source device, comprising: a light-emitting tube including a light-emitting portion that emits a light beam through electrodes and a pair of sealing portions provided on both sides of the light-emitting portion and lead wires for making electrical continuity between the electrodes and an external power source, the lead wires extending from the distal ends of the sealing portions, respectively; and a reflector having a concave reflecting surface that irradiates, from an opening thereof, the light beam emitted by the light-emitting tube after being aligned in a predetermined direction, wherein the light-emitting tube is provided such that one of the pair of sealing portions projects toward the light beam irradiation front side of the reflector, and the lead wire extending from one of the sealing portions extends up to an edge portion of the opening of the reflector located on the side from which the light beam is irradiated, the lead wire having a fold-down portion in which the lead wire extending up to the opening edge portion of the reflector is bent along the shape of the opening edge portion.