A flexible display device includes a flexible display panel, a first outer member disposed on a surface of the flexible display panel, and a first adhesive member attaching the first outer member to the flexible display panel. The first adhesive member includes an ultraviolet curable resin. A conversion rate of the ultraviolet curable resin in a region of the first adhesive member corresponding to a folding region of the flexible display panel is lower than a conversion rate of other regions adjacent thereto.