Electronic device including metal housing

An electronic device comprises: a metal frame including an opening in the central portion thereof; a metal plate included in the opening and having at least a part spaced apart from the metal frame; a coupling member securing the metal plate to the metal frame while filling the space between the metal frame and the metal plate; a printed circuit board brought into contact with or disposed adjacent to one surface of the metal plate; a communication module mounted on the printed circuit board and electrically connected to at least a part of the metal frame; a display brought into contact with or disposed adjacent to the surface of the metal plate or another surface thereof; a first plate covering at least a part of the display device while forming a part of an external housing together with the metal frame; and a second plate covering the opposite side of the display device while forming a part of the external housing together with the metal frame.