Disclosed is a display device including first and second set frames arranged adjacent to each other, a panel arranged on the first and second set frames, and a folding hinge unit arranged between the first set frame and the second set frame. The folding hinge unit includes a plurality of chain hinges arranged between the first and second set frames and configured to fold the first and second set frames inward and outward, and an X hinge including first and second connection chains coupled to the chain hinges and configured to control a folding trajectory of the chain hinges.