A display device includes a substrate, a display unit on the substrate, the display unit including a plurality of subpixels, a driver that applies a driving signal to the display unit, a pad unit that applies an electric signal received from the outside to the driver; a plurality of lines that connects the display unit to the driver or the pad unit to the driver; and a plurality of pad electrodes disposed at one ends of the lines connected to the driver. A width of one end of the pad electrode connected to the lines is narrower than widths of other areas of the pad electrode excepting the other end of the pad electrode.