A flexible display device may include a display panel including a display area and a bending area extending from one side of the display area to be bent, a back plate disposed on a rear surface of the display panel, a cushion tape disposed on a rear surface of the back plate, a driver integrated circuit (IC) disposed in a pad portion extending from the bending area, and a functional tape adhered between the cushion tape and the back plate and disposed to face the driver integrated circuit, so that effects capable of improving an EMI shielding function with a low cost, together with an adhesive function, and deriving an optimum efficiency, may be provided.