According to various embodiments, an electronic device may include a first plate, a second plate facing away from the first plate, and a side member surrounding a space between the first plate and the second plate, a middle plate disposed in the space between the first plate and the second plate in parallel with the second plate, a first Printed Circuit Board (PCB) disposed in a space between the second plate and the middle plate, a first electronic component mounted on the first PCB between the first PCB and the middle plate, a first heat transfer structure disposed between the first electronic component and the middle plate, a second electronic component including a first surface disposed in the space and spaced apart from the first PCB, a second surface facing away from the first surface, and a side face substantially perpendicular to the first surface or the second surface, and a second heat transfer structure. The second heat transfer structure may include a first thermal conductive layer including a first portion attached to the first surface or the second surface, and a second portion extending from the first portion toward the middle plate and at least partially having a thermal conductive path between the second electronic component and the middle plate, and a second electrical conductive layer including a third portion attached to the first portion so that the third portion constructs an electromagnetic shielding structure for the second electric component. Other various embodiments may also be possible.