An organic light-emitting display apparatus that has high-resolution and high-brightness includes a substrate comprising a major surface; an insulating layer disposed over the substrate and comprising a first inclined surface which is inclined with respect to the major surface and faces away from the substrate; a reflective first pixel electrode disposed over the first inclined surface and configured to cover a portion of the first inclined surface; a first intermediate layer disposed over the first pixel electrode and comprises a light emission layer; and a reflective opposite electrode disposed over the first intermediate layer.