A display device includes a display module including a first non-folding area, a folding area, and a second non-folding area sequentially defined along a first direction, and a cover member disposed under the display module. The cover member includes a first plate including a first support portion disposed under the first non-folding area and a first protrusion portion disposed under the folding area and a second plate including a second support portion disposed under the second non-folding area and a second protrusion portion disposed under the folding area. A thickness of the first protrusion portion is smaller than a thickness of the first support portion, and a thickness of the second protrusion portion is smaller than a thickness of the second support portion.