According to an embodiment of the present invention, a display device includes: a substrate including a through-hole, a peripheral area surrounding the through-hole, a wiring area surrounding the peripheral area, and a display area surrounding the wiring area; a gate insulating layer disposed on the substrate; a gate wire disposed in the wiring area and on the gate insulating layer; an interlayer insulating layer disposed on the gate wire; a data wire disposed in the wiring area and on the interlayer insulating layer; a middle insulating layer disposed on the data wire; and a first main insulating dam disposed in the wiring area and on the middle insulating layer, wherein the first main insulating dam includes an organic material, and wherein a width of a lower surface of the first main insulating dam is narrower than a width of an upper surface of the first main insulating dam.