A foldable display comprising: a display unit comprising a flexible display panel and a back plate, the flexible display panel comprising a first surface as a display surface and a second surface as a rear surface, and the back plate being disposed in contact with the second surface and comprising a plurality of inner folding portions, a plurality of outer folding portions, and a plurality of unfolding portions, the inner folding portions and the outer folding portions alternately arranged with an unfolding portion therebetween; and an accommodating case comprising an opening, through which the display unit is introduced or discharged, the accommodating case being configured to accommodate therein the display unit, which is folded at the inner folding portions and the outer folding portions, wherein the outer folding portions of the back plate have a length greater than a length of the inner folding portions, and wherein adjacent areas of the flexible display panel at the inner folding portions of the display unit, which are spaced apart from each other by one outer folding portion and by unfolding portions at opposite sides thereof outside the accommodating case, are brought into contact with each other when the display unit is folded in the accommodating case, and/or wherein adjacent areas of the back plate at the outer folding portions of the display unit, which are spaced apart from each other by one inner folding portion and by unfolding portions at opposite sides thereof outside the accommodating case, are brought into contact with each other when the display unit is folded in the accommodating case. a display unit comprising a flexible display panel and a back plate, the flexible display panel comprising a first surface as a display surface and a second surface as a rear surface, and the back plate being disposed in contact with the second surface and comprising a plurality of inner folding portions, a plurality of outer folding portions, and a plurality of unfolding portions, the inner folding portions and the outer folding portions alternately arranged with an unfolding portion therebetween; and an accommodating case comprising an opening, through which the display unit is introduced or discharged, the accommodating case being configured to accommodate therein the display unit, which is folded at the inner folding portions and the outer folding portions, wherein the outer folding portions of the back plate have a length greater than a length of the inner folding portions, and wherein adjacent areas of the flexible display panel at the inner folding portions of the display unit, which are spaced apart from each other by one outer folding portion and by unfolding portions at opposite sides thereof outside the accommodating case, are brought into contact with each other when the display unit is folded in the accommodating case, and/or wherein adjacent areas of the back plate at the outer folding portions of the display unit, which are spaced apart from each other by one inner folding portion and by unfolding portions at opposite sides thereof outside the accommodating case, are brought into contact with each other when the display unit is folded in the accommodating case.