An organic light emitting display device comprising: a substrate including an active area that displays images and a pad area that connects to an external driving circuit; a thin-film transistor, "TFT", including a drain electrode, a source electrode comprising a lower source electrode and an upper source electrode, and a gate electrode, wherein the drain electrode and the source electrode are in a same layer of the organic light emitting display device; an anode electrode, comprising a lower anode electrode, a central anode electrode and an upper anode electrode, in the active area of the substrate, wherein the lower anode electrode is a corrosion preventing layer formed of a transparent conductive material arranged to protect an upper surface of the upper source electrode and a lower surface of the central anode electrode; an organic light emitting layer on the anode electrode; a cathode electrode on the organic light emitting layer; a signal pad on the pad area of the substrate, wherein the signal pad is in the same layer as the drain electrode and the source electrode of the TFT; a first pad electrode on the signal pad and connected with the signal pad via a contact hole, wherein the first pad electrode comprises a same material as the anode electrode; a second pad electrode covering the first pad electrode; an auxiliary electrode (190, 210) connected with the cathode electrode, the auxiliary electrode (190, 210) including: a first auxiliary electrode provided in a same layer as the anode electrode and horizontally spaced apart from the anode electrode; and a second auxiliary electrode on the first auxiliary electrode, wherein the second auxiliary electrode is directly connected with the cathode electrode, wherein the second auxiliary electrode covers side surfaces and an upper surface of the first auxiliary electrode, and the second pad electrode covers an upper surface and side surfaces of the first pad electrode. a substrate including an active area that displays images and a pad area that connects to an external driving circuit; a thin-film transistor, "TFT", including a drain electrode, a source electrode comprising a lower source electrode and an upper source electrode, and a gate electrode, wherein the drain electrode and the source electrode are in a same layer of the organic light emitting display device; an anode electrode, comprising a lower anode electrode, a central anode electrode and an upper anode electrode, in the active area of the substrate, wherein the lower anode electrode is a corrosion preventing layer formed of a transparent conductive material arranged to protect an upper surface of the upper source electrode and a lower surface of the central anode electrode; an organic light emitting layer on the anode electrode; a cathode electrode on the organic light emitting layer; a signal pad on the pad area of the substrate, wherein the signal pad is in the same layer as the drain electrode and the source electrode of the TFT; a first pad electrode on the signal pad and connected with the signal pad via a contact hole, wherein the first pad electrode comprises a same material as the anode electrode; a second pad electrode covering the first pad electrode; an auxiliary electrode (190, 210) connected with the cathode electrode, the auxiliary electrode (190, 210) including: a first auxiliary electrode provided in a same layer as the anode electrode and horizontally spaced apart from the anode electrode; and a second auxiliary electrode on the first auxiliary electrode, wherein the second auxiliary electrode is directly connected with the cathode electrode, wherein the second auxiliary electrode covers side surfaces and an upper surface of the first auxiliary electrode, and the second pad electrode covers an upper surface and side surfaces of the first pad electrode.