An electronic device, according to one embodiment of the present invention, may comprise: a first dielectric which forms at least a part of the front surface of the electronic device; a second dielectric which forms at least a part of the rear surface of the electronic device; a side surface member which surrounds a space formed between the front surface and the rear surface and of which a part comprises a third dielectric; a display positioned in the space and visually exposed through the first dielectric; and an antenna module positioned in the space. The antenna module comprises: a printed circuit board comprising a first surface which faces, in the space, the third dielectric, and a second surface which is oriented in a direction opposite to that of the first surface; and at least one antenna element which is disposed on the first surface or inside the printed circuit board so as to be adjacent to the first surface, and which forms a beam pattern toward the side surface member. In addition, other various embodiments are possible.