Provided is a display device including a display panel including a first non-folding region, a folding region, and a second non-folding region which are sequentially arranged along a first direction, a first metal plate including a plurality of holes overlapping the folding region on a plane, and disposed below the display panel, a second metal plate disposed below the first metal plate, and an adhesive layer disposed between the first metal plate and the second metal plate, wherein at least one of the lower surface of the first metal plate or the upper surface of the second metal plate includes grooves overlapping the first non-folding region and the second non-folding region on a plane, wherein the adhesive layer is disposed in the grooves, so that the display device may ensure surface quality, and folding reliability.