To provide an organic light-emitting display device which can minimize twisting of a sealing substrate.

The organic light-emitting display device includes: a display substrate having an organic light-emitting structural body; a sealing substrate arranged opposedly to the display substrate; a sealant which is arranged between the display substrate and the sealing substrate and mutually bonds the display substrate and the sealing substrate; and a substrate deformation preventing body arranged between the sealant and the organic light-emitting structural body.