An electronic device is provided. The electronic device includes a housing that forms a rear surface of the electronic device and at least a portion of a side surface of the electronic device, a display that forms a portion of a front surface of the electronic device, a flexible layer extended from the display, the flexible layer including: a bent portion, and a planar portion extended from the bent portion and disposed between the display and the rear surface of the housing, the planar portion including a first surface facing the display and a second surface facing the rear surface, a display driver integrated circuit (DDIC) mounted on the first surface of the planar portion of the flexible layer, the DDIC electrically connected to the display, and a flexible printed circuit board connected with the flexible layer on the second surface of the planar portion of the flexible layer.