An electronic device is provided, which includes a display member including at least one piece of glass, a housing surrounding at least a portion of the display member to form a space inside the electronic device, a mounting member coupled to at least one side of the housing, a light output device disposed inside the mounting member to output light to the display member, a light refracting member refracting light emitted from the light output device, and a heat radiating member including at least a first portion disposed adjacent to the light output device and at least second portion extending to the housing to surround at least a portion of the at least one piece of glass, wherein at least a part of the heat radiating member contacts the space.