An antenna module includes: an integrated circuit (IC) configured to generate a radio frequency (RF) signal; and a substrate including an antenna portion providing a first surface of the substrate, and a circuit pattern portion providing a second surface of the substrate. The antenna portion includes first antenna members configured to transmit the RF signal, cavities corresponding to the first antenna members, through vias respectively disposed in the cavities and respectively electrically connected to the first antenna members, and a plating member disposed in at least one cavity among the cavities. The circuit pattern portion includes a circuit pattern and an insulating layer forming, for each of the through vias, an electrical connection path to the IC.