An organic light-emitting display device includes: a display substrate; an organic light-emitting device including a first electrode, an intermediate layer including an organic emission layer, and a second electrode; a pixel-defining layer; an anchor on the pixel-defining layer, the anchor having a cross-sectional width that narrows along a direction perpendicular to a surface of the display substrate; and a thin film encapsulation layer covering the organic light-emitting device and an outer surface of the anchor, the thin film encapsulation layer including an inorganic layer and an organic layer covering the inorganic layer.