A display device includes a wire substrate including a wire unit for driving the display device, an integrated circuit chip mounted at the wire substrate, and a pad unit extended from the wire unit to be disposed between the wire substrate and the integrated circuit chip. The pad unit is connected to the integrated circuit chip. The pad unit includes a first conductive layer extended from the wire unit, and a second conductive layer disposed on the first conductive layer. The hardness of the second conductive layer is less than the hardness of the first conductive layer.