Disclosed is an organic light-emitting display device in which a substrate and an encapsulation substrate are joined by a frit and a reinforcing structure. The first substrate has a pixel region in which an organic light-emitting diode is formed, and a non-pixel region formed outside the pixel region. The second substrate is attached the first substrate by the frit. A bracket is joined with substrates by the reinforcing structure. A curable material is applied to inside the frame, moves between the first and second substrates, and then cured to form the reinforcing structure.