A display device includes a display module including a first non-folding region, a folding region, and a second non-folding region arranged in a first direction, a first support plate disposed on the display module, a second support plate disposed on the first support plate, a heat dissipation layer disposed between the first and second support plates, and including a bending portion overlapping the folding region, a first adhesive layer disposed between the first support plate and the heat dissipation layer, and a second adhesive layer disposed between the second support plate and the heat dissipation layer. An opening defined in each of the first and second adhesive layers has a width greater than a width of the bending portion of the heat dissipation layer in a portion overlapping the folding region.