An organic light-emitting display device includes a substrate, a plurality of thin film transistors disposed on a first surface of the substrate, a passivation layer covering the plurality of thin film transistors, a plurality of first pixel electrodes disposed on the passivation layer, the first pixel electrodes overlapping the plurality of thin film transistors, each of the first pixel electrodes including a reflection layer formed of a conductive material that reflects light, a plurality of second pixel electrodes disposed on the passivation layer, the second pixel electrodes being connected to the first pixel electrodes respectively, the second pixel electrodes being formed of a conductive material that transmits light, an opposite electrode, the opposite electrode both allowing light to pass therethrough and reflecting light, the opposite electrode facing the first and second pixel electrodes, and an organic layer disposed among the first and second pixel electrodes and the opposite electrode.