To provide an endoscope device that is made lightweight by miniaturizing a heat dissipation part securing heat dissipation capability for a housing, and allows for good observation over a long time.SOLUTION: An endoscope device 1 comprises: an insertion part 2； an operation part body 5 that is connected to a proximal end of the insertion part 2 and can be used as a grip part； a light source part 4L that supplies illumination light to a light guide 10 provided inside the operation part body 5； and a heat radiation member 40 disposed in the operation part body 5 and thermally connected to the light source part 4L. The heat radiation member 40 has an open end 45a into which air flows and a vent 46 having an area smaller than the area of the air inflow part 45a.SELECTED DRAWING: Figure 6C【課題】筐体に対する放熱能力を確保する放熱部を小型にして軽量で長時間の良好な観察を可能にする内視鏡装置を提供する。【解決手段】内視鏡装置１は、挿入部２と、挿入部２の基端が接続され、把持部と成り得る操作部本体５と、操作部本体５の内部に設けられたライトガイド１０に照明孔を供給する光源部４Ｌと、操作部本体５に配置されて光源部４Ｌと熱的に接続される放熱部材４０と、を備え、放熱部材４０は、空気が流入する開放端４５ａと、空気流入部４５ａの面積よりも面積が小さい通気孔４６を有している。【選択図】図６Ｃ
