A display device includes a substrate including a display area and a peripheral area outside the display area, the peripheral area including a bendable bending region, a display member on the display area of the substrate to display an image, and a protection film under the substrate, the protection film including a groove at a position corresponding to the bending region of the peripheral area, wherein the groove includes a bottom surface and inner walls extending from the bottom surface to a surface of the protection film, a boundary part being defined at an intersection of each inner wall with the surface of the protection film, and wherein boundary parts adjacent to opposite ends of the protection film are separated from the opposite ends of the protection film, respectively.