An electronic device is provided. The electronic device includes a housing and an antenna module. The housing includes a front plate, a rear plate disposed opposite the front plate, and a lateral member surrounding a space between the front plate and the rear plate and including a conductive portion and a non-conductive portion. The antenna module is disposed in the space and includes a printed circuit board (PCB) and at least one antenna element. The PCB has a first surface disposed to face the lateral member in the space, and a second surface disposed opposite the first surface. The at least one antenna element is disposed on the first surface or near the first surface in the PCB, and forms a beam pattern toward the lateral member.