A foldable display, comprising: a flexible substrate a display layer disposed on a top surface of the flexible substrate; an encapsulation layer covering the display layer; and a back plate disposed under a bottom surface of the flexible substrate, wherein the back plate includes: a reference plane; a first folding plane disposed at one side of the reference plane; a second folding plane disposed at another side of the reference plane; a first bending part disposed between the reference plane and the first folding plane and having a first bending radius; and a second bending part disposed between the reference plane and the second folding plane and having a second bending radius, characterized in that: the first folding plane is thinner than the reference plane; the first folding plane is configured to be folded, at first, over the reference plane; the second folding plane is configured to be folded, at second, over the first folding plane; and the second bending radius of the second bending part is larger than the first bending radius, and the second bending part is folded over the first folding plane. a flexible substrate a display layer disposed on a top surface of the flexible substrate; an encapsulation layer covering the display layer; and a back plate disposed under a bottom surface of the flexible substrate, wherein the back plate includes: a reference plane; a first folding plane disposed at one side of the reference plane; a second folding plane disposed at another side of the reference plane; a first bending part disposed between the reference plane and the first folding plane and having a first bending radius; and a second bending part disposed between the reference plane and the second folding plane and having a second bending radius, characterized in that: the first folding plane is thinner than the reference plane; the first folding plane is configured to be folded, at first, over the reference plane; the second folding plane is configured to be folded, at second, over the first folding plane; and the second bending radius of the second bending part is larger than the first bending radius, and the second bending part is folded over the first folding plane. a reference plane; a first folding plane disposed at one side of the reference plane; a second folding plane disposed at another side of the reference plane; a first bending part disposed between the reference plane and the first folding plane and having a first bending radius; and a second bending part disposed between the reference plane and the second folding plane and having a second bending radius, characterized in that: the first folding plane is thinner than the reference plane; the first folding plane is configured to be folded, at first, over the reference plane; the second folding plane is configured to be folded, at second, over the first folding plane; and the second bending radius of the second bending part is larger than the first bending radius, and the second bending part is folded over the first folding plane. the first folding plane is thinner than the reference plane; the first folding plane is configured to be folded, at first, over the reference plane; the second folding plane is configured to be folded, at second, over the first folding plane; and the second bending radius of the second bending part is larger than the first bending radius, and the second bending part is folded over the first folding plane.