Disclosed is an organic light emitting display device in which water is prevented from externally permeating thereinto. The organic light emitting display device comprises a first substrate on which an organic light emitting diode and a driving device designed to drive the organic light emitting diode are formed; a second substrate facing the first substrate; a viscosity layer interposed between the first substrate and the second substrate to cover entire areas of the first substrate and the second substrate, the viscosity layer including a filler capable of water absorption; and a first adhesion layer arranged to adhere the viscosity layer to the first substrate, wherein the viscosity layer is a material including a cross-linkage functional group and having a viscosity characteristic at room temperature.