A display device includes a pixel array, a switch element, and inspection lines. In a display area, at least a portion of an outer region includes a curved section and pixels to which a data line is connected are disposed. The switch element is disposed in a bezel area outside the display area, and supplies a test voltage to the data line in response to an enable signal. The inspection lines connect an inspection pad part and switch elements and are disposed in a staircase form along the curved section. The switch elements are disposed along the inspection lines and include first and second switch elements disposed to be adjacent to each other in a direction perpendicular to each other.