An electronic device according to various embodiments is provided and includes a conductive inner module in which a plurality of layers are stacked; an electrical opening formed in at least a portion of the rim of the conductive inner module when stacking the plurality of layers; and an antenna module disposed at the periphery of the electrical opening, wherein the antenna module may include a feeding part formed on at least one of a plurality of layers forming the conductive inner module, and a conductive pattern which is connected to the feeding part and disposed circumferencing at least one of the electrical openings.