Provided are an organic light-emitting display device and method of manufacturing the same. An organic light-emitting display device includes: a thin-film transistor on a substrate, an auxiliary electrode member in a contact area on the substrate, the auxiliary electrode member being spaced apart from the thin-film transistor, an insulating member on the thin-film transistor and the auxiliary electrode member, the insulating member including an opening through which at least a part of the auxiliary electrode member is exposed in the contact area, and an organic light-emitting element on the insulating member, the organic light-emitting element including: an anode, an organic light-emitting layer, and a cathode, wherein a side surface of the opening is disposed closer to the inside of the opening than a side surface of the auxiliary electrode member, such that the cathode is in contact with the auxiliary electrode member without a reverse-tapered partitioning wall thereover.