To provide a lamp light source device having high cooling effect which can be continued for a long time, which can be used for a television receiver for rear projection etc.
This lamp light source device of this invention is provided with a discharge lamp a reflector surrounding the discharge lamp and reflecting light in a fixed direction, a transparent protection plate provided to make a space surrounded by the reflector a closed space and to plug a light emission opening, a plurality of heat radiating fins provided at a right angle to an optical axis in the closed space and a baffle plate surrounding the reflector and the heat radiating fins and leading at a right angle to the optical axis of the reflector. Cooling air is made pass between the outside of the reflector and the baffle plate to cool the heat radiating fins heated by heat generated by the discharge lamp. Since the cooling effect is high, a projection operation can be continued for a long time, and it can be used for the television receiver for rear projection etc.
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