A display device includes: a substrate having a mounting area; a pad electrically coupled to a wire on the substrate and at the same layer as the wire; an adhesive layer bonded to a bottom of the substrate having the mounting area; a supporting substrate bonded to a bottom of the adhesive layer to which the substrate is bonded; a flexible printed circuit board electrically coupled to the pad to input a power and a signal to the pad; and a conductive layer between the flexible printed circuit board and the pad to electrically couple the flexible printed circuit board to the pad, and at least a portion of the adhesive layer on the mounting area is exposed to the outside to be coupled to the conductive layer.