PROBLEM TO BE SOLVED: To provide a light irradiation device capable of efficiently releasing heat in a housing to the outside of the housing, and to provide a light irradiation treatment/prevention device.SOLUTION: A light irradiation device 1 includes: a light source 2 a reflective umbrella 10 a heat radiation part 7 connected to the reflective umbrella 10 to transfer heat and a housing 8 for storing the light source 2. The housing 8 includes a release part 24 penetrating therethrough from the inside to the outside, and a protrusion part 23 provided protrudingly to the outside. The protrusion part 23 is configured to store the heat radiation part 7 in the inside.COPYRIGHT: (C)2014,JPO&INPIT【課題】本発明は、筐体内の熱を効率的に筐体の外部に放出することができる光照射装置及び光照射治療・予防装置を得る。【解決手段】本発明の光照射装置1は、光源2と、反射傘10と、該反射傘10に熱伝導可能に接続する放熱部7と、光源2を格納する筐体8とを備え、該筺体8は、内側と外側とを貫通する放出部24を有して外側に突出して設けられる膨出部23を備え、該膨出部23は、内側で放熱部7を収容するという構成を有する。【選択図】図2
