A display device includes a substrate, a semiconductor layer disposed on the substrate, a gate insulating layer disposed on the semiconductor layer, a gate layer including a first layer disposed on the gate insulating layer and including a first metal, and a second layer disposed on the first layer and including a second metal, where a first through hole is defined through the second layer in a direction perpendicular to an upper surface of the first layer, and an interlayer insulating layer disposed on the gate layer.