A display device includes: a substrate including a first component area in which a first transmission portion is arranged, a second component area that surrounds the first component area and in which a second transmission portion is arranged, and a main display area surrounding at least a portion of the second component area; an insulating layer having a first transmission hole corresponding to the first transmission portion and a second transmission hole corresponding to the second transmission portion, the first transmission hole and the second transmission hole exposing an upper surface of the substrate; a plurality of display elements arranged on the insulating layer and corresponding to the first component area, the second component area, and the main display area; and an alignment pattern arranged on the substrate and overlapping the second transmission hole and configured to align a component with the second component area.