Light source device

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A start assisting light source is configured such that it can be mounted simply and reliably at a position capable of efficiently radiating UV-light for enhancing the starting performance of a high pressure discharge lamp to discharge chamber without being heated to a high temperature during lighting of the lamp and also adopted to a simple constitution of not increasing the manufacturing cost. A start assisting light source 3 comprising an airtight vessel 18 filled with a rare gas and a pipe member 19 that penetrates through the vessel is mounted to an electrode lead 8 which protrudes from the end face 10 of an electrode seal portion 9L secured to a bottom hole 14 of the concave reflector 2 by inserting the electrode lead 8 through the pipe member 19.