Various embodiments relate to a heat radiation device for a heat source. The heat radiation device includes a body and a coating layer, wherein the body has a first section and at least one second section projecting from the first section, the first section has a mounting surface for mounting and thermally contacting with the heat source and the coating layer is applied on the surface other than the mounting surface of the first section and a surface of the at least one second section, wherein the coating layer has higher thermal dissipation performance than the body. In addition, various embodiments further relate to an illuminating device having the above type of heat radiation device.