HEAT TRANSFER MEMBER AND COOLING DEVICE

To provide a heat transfer member and a cooling device having excellent cooling efficiency by suppressing a decrease in the fluidity of the working fluid of a liquid phase flowing between fin portions.SOLUTION: A heat transfer member according to an embodiment provided on the inner surface of a container containing a working fluid in the internal space, and is thermally connected to a heating element at a mounting position on the outer surface of the container includes a plate-shaped portion having a lower surface arranged on the inner surface, a plurality of fin portions provided on the upper surface of the plate-shaped portion, one or more first protrusions provided on the surface of the fin portion, one or more second protrusions provided on the surface of the first protrusion and smaller than the first protrusion, a closed portion that faces the plate-shaped portion and is connected to the plurality of fin portions to close a cavity between the plurality of fin portions, and one or more through holes penetrating the closed portion.SELECTED DRAWING: Figure 2 【課題】フィン部の間を流通する液相の作動流体の流動性の低下を抑制し、優れた冷却効率を有する、伝熱部材および冷却デバイスを提供する。【解決手段】実施形態の伝熱部材は、容器の内部空間に作動流体が含まれ、前記容器の外面の取付位置で発熱体と熱的に接続され、前記容器の内面に設けられる伝熱部材であって、前記内面に配される下面を有する板状部と、前記板状部の上面に設けられる複数のフィン部と、前記フィン部の表面に設けられる１つ以上の第１突起部と、前記第１突起部の表面に設けられ、前記第１突起部よりも小さい１つ以上の第２突起部と、前記板状部に対向し、前記複数のフィン部に連結して前記複数のフィン部の間の空洞を閉塞する閉塞部と、前記閉塞部を貫通する１つ以上の貫通孔とを備える。【選択図】図２