A display device includes: a display module comprising a first non-folding area, a second non-folding area, and a folding area between the first non-folding area and the second non-folding area; a first plate under the display module at the first non-folding area; and a second plate under the display module at the second non-folding area and spaced apart from the first plate, at least one of the first or second plates comprising: a first support layer; a second support layer facing the first support layer; and an encapsulation layer between the first and second support layers along an edge of the first and second support layers and encapsulating a separation space formed between the first and second support layers in a corresponding non-folding area of the first and second non-folding areas.