According to an embodiment, an electronic device may include: a housing including a first surface and a second surface facing away from the first surface; a display at least partially accommodated in the housing and viewable through the first surface; a conductive layer disposed between the display and the second surface and including a first opening; a support disposed between the second surface and the conductive layer and including a conductive portion; and a wireless communication circuit electrically connected to the conductive layer, and configured to transmit and/or receive a signal through an antenna including at least a portion of the conductive layer surrounding the first opening.