According to various embodiments, an electronic device may include a housing including a first plate, a second plate facing away from the first plate, and a side housing surrounding a space between the first plate and the second plate and joined to the second plate or provided integrally with the second plate, a display viewable through at least part of the first plate, a first Printed Circuit Board (PCB) disposed between the first plate and the second plate and including at least one first ground layer, a Flexible Printed Circuit Board (FPCB) at least partially overlapping the first PCB when viewed from above the first plate and including a first end electrically coupled to the first PCB, a second end, and at least one second ground layer, and a conductive structure comprising a conductive material disposed between the first PCB and the FPCB and electrically coupling the first ground layer and the second ground layer.