A display device includes a first non-folding area, a second non-folding area, and a folding area, which are disposed in a first direction includes a display panel including first to third pixel areas, which are spaced apart from each other on a plane defined in the first direction and a second direction crossing the first direction and a window layer disposed on the display panel. The window layer includes a first rigid part, a second rigid part, and a first soft part, a first interface and a second interface overlaps at least one area of first to third pixel areas on the plane, and an absolute value of a difference in refractive index between the first rigid part and the first soft part is 0.02 or less, and an absolute value of a difference in refractive index between the second rigid part and the first soft part is 0.02 or less.