According to an embodiment of the disclosure, an electronic device comprises: a housing including a front plate, a rear plate positioned on the opposite side from the front plate, and a side bezel surrounding at least part of the space between the front plate and the rear plate, and including a first conduction unit comprising a conductor, a second conduction unit comprising a conductor positioned such that a first segment is between the second conduction unit and one end of the first conduction unit, and a third conduction unit comprising a conductor positioned such that a second segment is between the third conduction unit and an other end of the first conduction unit; a support positioned inside the space and connected to the first conduction unit, the second conduction unit, and the third conduction unit, and which includes a first opening extending from the first segment and positioned within a specified proximity of the first conduction unit; a printed circuit board positioned inside the space between the support and the rear plate, and including first and second terminals electrically connected to at least part of the support surrounding the first opening, a ground plane, a first electrical path electrically connecting the second terminal and a first position of the ground plane, and a second electrical path electrically connecting the second terminal and a second position of the ground plane; and a wireless communication circuit electrically connected to the first terminal and configured to transmit and/or receive signals in a selected or designated frequency band, wherein, when viewed from above the rear plate, at least part of the first opening may extend to the first segment by passing between the first terminal and the second terminal.