Patent ID: 8421359

Claim:
A discharge lamp unit comprising: a discharge lamp radiating light; a plurality of circuit components including a self-heating component that radiates heat produced thereby, supplying power to the discharge lamp unit; a heat radiation member capable of radiating the heat produced by the self-heating component having a first surface facing the self-heating component and a second surface facing other circuit components, the heat radiation member being made of metal and arranged at a portion between the self-heating component and the other circuit components so as to at least partly cover the self-heating component, at the first surface of the heat radiation member; a molded member arranged so as to cover the second surface of the heat radiation member; a casing member holding the circuit components therein, including a metal portion where the heat radiation member is connected thereto; and a partitioning member comprising the heat radiation member and the molded member, the partitioning member partitioning between a portion at which the self-heating component is arranged and a portion at which other circuit components are arranged and partitioning between a portion at which the discharge lamp is disposed and a portion at which the self-heating component is disposed, wherein the self-heating component contacts the metal portion of the casing member and the heat-radiation member, and the self-heating component is arranged to be sandwiched by the metal portion of the casing and the heat radiation member, and the molded member includes a partitioning wall that partitions a portion at which the discharge lamp unit is disposed and a portion at which a circuit component is disposed.