A display device includes a display module including a plurality of non-folding portions arranged along a first direction, and a folding portion disposed between the non-folding portions; a support part facing each of the non-folding portions and the folding portion; an adhesive between the support part and each of the non-folding portions, respectively; and a sub-support part between the folding portion and the support part. Along a second direction crossing the first direction, a first width of the sub-support part is less than a second width of the display module.