A flexible display device including: a flexible display panel displaying an image; a touch sensing layer provided on the flexible display panel; and a window provided on the touch sensing layer and including a flat area and a bending area. The window includes a flexible film and a hard coating film provided on the flexible film, the thicknesses of the flexible film in the flat area and the bending area differ, and the thicknesses of the hard coating film in the flat area and the bending area also differ.