An electronic device includes a housing including a first plate, a second plate, and a side member including a first conductive member and a second conductive member which surround a space between the first plate and the second plate and are separated from each other by a slit, a support member interposed in a space between the first plate and the second plate, a PCB, a wireless communication circuit disposed on the PCB, a display, a connection part protruding toward an inner part of the housing from an area of the second conductive member that is adjacent to the slit, the connection part being electrically connected with the second conductive member, and a coupling member coupled to the connection part. The wireless communication circuit is configured to electrically connect the second conductive member and the connection part with an antenna circuit provided on the PCB.