An organic light emitting display device comprising: a first overcoating layer on a driving transistor (Tdr) and a supply electrode, the first overcoating layer including a first contact hole and a second contact hole; a connection electrode on the first overcoating layer and connected to the supply electrode through the second contact hole; a first electrode on the first overcoating layer and connected to the driving transistor (Tdr) through the first contact hole; a second overcoating layer on the first overcoating layer, the second overcoating layer covering the first and second contact holes (131, 132) and not covering a portion of the first electrode; an auxiliary electrode on the second overcoating layer and connected to the connection electrode, wherein the second overcoating layer comprises a third contact hole, and the auxiliary electrode is connected to the connection electrode through the third contact hole; an organic emission layer on the portion of the first electrode which is not covered by the second overcoating layer; a second electrode on the organic emission layer and electrically connected to the auxiliary electrode,. the second electrode overlapping the first electrode and the auxiliary electrode; and a partition wall on an upper side of the auxiliary electrode, wherein the partition wall has a reverse taper structure where a width of a bottom of the partition wall is narrower than that of a top of the partition wall and the second electrode is disposed on the top of the partition wall but is not disposed in a partial area near a contact area where the partition wall contacts the auxiliary electrode, such that the second electrodes of adjacent sub pixels are disconnected from each other. a first overcoating layer on a driving transistor (Tdr) and a supply electrode, the first overcoating layer including a first contact hole and a second contact hole; a connection electrode on the first overcoating layer and connected to the supply electrode through the second contact hole; a first electrode on the first overcoating layer and connected to the driving transistor (Tdr) through the first contact hole; a second overcoating layer on the first overcoating layer, the second overcoating layer covering the first and second contact holes (131, 132) and not covering a portion of the first electrode; an auxiliary electrode on the second overcoating layer and connected to the connection electrode, wherein the second overcoating layer comprises a third contact hole, and the auxiliary electrode is connected to the connection electrode through the third contact hole; an organic emission layer on the portion of the first electrode which is not covered by the second overcoating layer; a second electrode on the organic emission layer and electrically connected to the auxiliary electrode,. the second electrode overlapping the first electrode and the auxiliary electrode; and a partition wall on an upper side of the auxiliary electrode, wherein the partition wall has a reverse taper structure where a width of a bottom of the partition wall is narrower than that of a top of the partition wall and the second electrode is disposed on the top of the partition wall but is not disposed in a partial area near a contact area where the partition wall contacts the auxiliary electrode, such that the second electrodes of adjacent sub pixels are disconnected from each other.