Disclosed in the present invention is a transparent display device. The transparent display device according to the present invention comprises: a frame having first and second apertures; a transparent display panel disposed on the first aperture of the frame; and a control module, disposed on the second aperture of the frame, for controlling the transparent display panel, wherein the frame is installed to cover the front surface of the door unit of a certain product or is separated from the front surface of the door unit of the certain product, and wherein an extension frame extended from an edge of the frame toward the door unit of the certain product can engage with the side of the edge of the door unit of the certain product.