An organic light emitting display device, comprising: a light-shielding layer and a first auxiliary electrode each disposed in a display area (A/A) of a substrate defined by the display area (A/A) and a pad area (P/A); a buffer layer covering the light-shielding layer and the first auxiliary electrode; a thin film transistor disposed on the buffer layer such that the thin film transistor overlaps the light-shielding layer; a lower pad part disposed on the buffer layer of the pad area (P/A); an upper pad part spaced from the lower pad part via an interlayer insulation film and connected to the lower pad part through a pad part contact hole; a second auxiliary electrode connected to the first auxiliary electrode through a first contact hole; a planarization film covering the thin film transistor and the second auxiliary electrode; a pad protection layer covering a side surface of the upper pad part and exposing a part of an upper surface of the upper pad part; a first electrode disposed on the planarization film and electrically connected to the thin film transistor; a third auxiliary electrode connected to the second auxiliary electrode through a second contact hole; an organic light emitting layer disposed on the first electrode; and a second electrode disposed on the organic light emitting layer including an emission layer and electrically connected to the third auxiliary electrode wherein the thin film transistor comprises: an active layer disposed on the buffer layer and including a channel area, a source area and a drain area; a gate insulation film disposed on the channel area of the active layer; a gate electrode disposed on the gate insulation film; a source electrode connected to the source area of the active layer; and a drain electrode connected to the drain area of the active layer, characterized in that the drain electrode is connected to the light-shielding layer through a third contact hole. a light-shielding layer and a first auxiliary electrode each disposed in a display area (A/A) of a substrate defined by the display area (A/A) and a pad area (P/A); a buffer layer covering the light-shielding layer and the first auxiliary electrode; a thin film transistor disposed on the buffer layer such that the thin film transistor overlaps the light-shielding layer; a lower pad part disposed on the buffer layer of the pad area (P/A); an upper pad part spaced from the lower pad part via an interlayer insulation film and connected to the lower pad part through a pad part contact hole; a second auxiliary electrode connected to the first auxiliary electrode through a first contact hole; a planarization film covering the thin film transistor and the second auxiliary electrode; a pad protection layer covering a side surface of the upper pad part and exposing a part of an upper surface of the upper pad part; a first electrode disposed on the planarization film and electrically connected to the thin film transistor; a third auxiliary electrode connected to the second auxiliary electrode through a second contact hole; an organic light emitting layer disposed on the first electrode; and a second electrode disposed on the organic light emitting layer including an emission layer and electrically connected to the third auxiliary electrode wherein the thin film transistor comprises: an active layer disposed on the buffer layer and including a channel area, a source area and a drain area; a gate insulation film disposed on the channel area of the active layer; a gate electrode disposed on the gate insulation film; a source electrode connected to the source area of the active layer; and a drain electrode connected to the drain area of the active layer, characterized in that the drain electrode is connected to the light-shielding layer through a third contact hole. an active layer disposed on the buffer layer and including a channel area, a source area and a drain area; a gate insulation film disposed on the channel area of the active layer; a gate electrode disposed on the gate insulation film; a source electrode connected to the source area of the active layer; and a drain electrode connected to the drain area of the active layer, characterized in that the drain electrode is connected to the light-shielding layer through a third contact hole.