Disclosed is an electronic device including a housing having a first surface, a second surface and a side surface, a touch screen display including a conductive plane substantially parallel with the first surface, a printed circuit board positioned between the touch screen display and the second surface substantially parallel with the conductive plane; a wireless communication circuit, and a side member forming at least a portion of the side surface, which includes a first elongated part surrounding at least a portion of the conductive plane and formed of a non-conductive material, and a second elongated part surrounding at least a portion of the printed circuit board, but no portion of the conductive plane, and extending in parallel with the first elongated part. The second elongated part is formed of a conductive material, and is electrically coupled to the wireless communication circuit.