An organic light-emitting display device including an encapsulating layer and an encapsulating substrate disposed on the encapsulating layer is provided. The encapsulating layer may cover a light-emitting element. The encapsulating substrate may include a material having high thermal conductivity. A reinforcing member may overlap the light-emitting element between the encapsulating layer and the encapsulating substrate. Thus, in the organic light-emitting display device, the rigidity of the encapsulating substrate may be complemented by the reinforcing member. Thereby, the organic light-emitting display device may prevent damage of the light-emitting element due to external impact.