Provided is a display device including a substrate including a display area including a plurality of pixel areas, and a non-display area outside the display area, a pixel circuit layer including a plurality of circuit elements in the display area, a display element layer including a plurality of light-emitting elements in the display area on the pixel circuit layer, and first and second alignment lines on the substrate, and each including a main line at the same layer as at least one electrode on the display element layer, and a sub line electrically connected to the main line and at the same layer as at least one electrode on the pixel circuit layer, wherein the first alignment line and the second alignment line do not include the main line in the non-display area, and include the sub line to be spaced apart from one edge of the substrate.