An organic light-emitting display apparatus includes a substrate; an emission control circuit formed on the substrate; an insulating layer covering the control circuit; an organic light-emitting device including a first electrode and a second electrode and formed on the insulating layer; and a contact wiring structure for electrically connecting the emission control circuit and the organic light-emitting device. The contact wiring structure includes a first conductive layer made of the same material as the first electrode; a second conductive layer made of the same material as the second electrode; and a diamond-like carbon film between the first conductive layer and the second conductive layer.