PROBLEM TO BE SOLVED: To provide an LED light source device that has a light distribution angle of 30 degrees or less and has excellent light beam distribution and directivity, and a desktop projector including the light source device.SOLUTION: There is provided an LED light source device including a mounting board 41 that has a metal surface, a first insulating layer 42 that is formed on the surface of the mounting board 41, a wiring layer 43 that is formed as a top layer of the first insulating layer 42, and a plurality of LED chips 46 that have the same specification and are mounted in matrix on the surface of the mounting board 41, the LED light source device further including a reflector block 50 having micro-reflectors in the same number as that of the LED chips 46, where the micro-reflectors each have a bottom opening and an upper opening having a larger diameter than that of the bottom opening； the wiring layer 43 includes a first conductive layer that is formed by applying a metallic paste containing metallic powder and a resin impregnated in the insulating layer 42 and cured and applying heat, and a second conductive layer that is formed on the top face of the first conductive layer and has a lower resistance than that of the first conductive layer.SELECTED DRAWING: Figure 2【課題】配光角が３０度以下であり、光束分布および指向性に優れたＬＥＤ光源装置および同光源装置を備える卓上型のプロジェクターの提供する。【解決手段】表面が金属である実装基板４１と、実装基板４１表面に形成された第一の絶縁層４２と、第一の絶縁層４２の上層として形成された配線層４３と、実装基板４１上にマトリックス状に表面実装された、同一仕様である多数個のＬＥＤチップ４６と、を備えたＬＥＤ光源装置において、ＬＥＤチップ４６と同数のマイクロリフレクターを有するリフレクターブロック５０を備え、マイクロリフレクターが、底部開口と底部開口よりも大径の上部開口とを有し、配線層４３が、絶縁層４２に染み込み硬化する樹脂および金属粉末を含有する金属ペーストを塗布し、加熱して形成される第一の導電層と、第一の導電層の上面に形成される第一の導電層よりも低抵抗の第二の導電層とを備えて構成される。【選択図】図２
