An antenna device according to an embodiment of the present invention includes a substrate layer, an antenna unit formed on a top surface of the substrate layer, a circuit wiring disposed on the top surface of the substrate layer and directly connected to the antenna unit, a stress compensation layer covering the circuit wiring on the top surface of the substrate layer and having a thickness greater than a thickness of the substrate layer, a first dielectric layer formed on a bottom surface of the substrate layer to overlap the circuit wiring in a planar view, and a first ground layer overlapping the circuit wiring in the planar view with the first dielectric layer or the stress compensation layer interposed therebetween.