Disclosed is an electronic device including: a housing including a first plate, a second plate facing away from the first plate, and a side member surrounding a space between the first plate and the second plate, connected to the second plate or integrally formed with the second plate, and including a first portion comprising a conductive material, wherein the first portion of the side member includes a plurality of through-holes aligned in a first direction substantially parallel to the first plate and a non-conductive material inside the through-holes; a structure disposed inside the space to face the through-holes and including at least one conductive path; and a wireless communication circuit electrically connected to the conductive path. Various other embodiments inferred from the specification are also possible.