An electronic device includes a cover glass, a back cover, a side member that surrounds a space between the cover glass and the back cover, wherein at least a portion of the side member is formed of a conductive member, a support member that is extended from the side member and includes at least one opening, a first printed circuit board that is interposed between the support member and the back cover or between the support member and the cover glass, a second printed circuit board that is interposed between the first printed circuit board and the back cover or between the first printed circuit board and the cover glass, an electrical component that is positioned on the first printed circuit board, and a wireless communication circuit that is positioned on the second printed circuit board.