A flexible display device, comprising: a first body; a second body; a flexible display unit arranged on a surface of the first body and the second body; and a hinge unit connecting the first body and the second body to each other such that the first body and the second body can be folded and unfolded with respect to each other, wherein the hinge unit includes a plurality of hinge segments such that in a folding state of the flexible display unit, the second body is arranged to cover a rear surface of the first body as an interval between the hinge segments is increased, and in an unfolded state of the flexible display unit, the first body and the second body are arranged in parallel with the interval between the hinge segments being decreased, characterised in that the flexible display device further comprises: a rear plate (231, 331) coupled to a rear surface of the flexible display unit, and configured to support the flexible display unit, wherein the rear plate includes: mounting portions (233a, 333a, 333a') extended in one direction, and recessed to couple the rear surface of the flexible display unit; and a bending supporting portion (234, 334) extended towards the outside from both sides of the mounting portions, wherein the bending supporting portion (234, 334) is concaved downward, and wherein a metallic supporting member is coupled to a bottom surface of the bending supporting portion (234, 334), in correspondence to a shape of the bottom surface. a first body; a second body; a flexible display unit arranged on a surface of the first body and the second body; and a hinge unit connecting the first body and the second body to each other such that the first body and the second body can be folded and unfolded with respect to each other, wherein the hinge unit includes a plurality of hinge segments such that in a folding state of the flexible display unit, the second body is arranged to cover a rear surface of the first body as an interval between the hinge segments is increased, and in an unfolded state of the flexible display unit, the first body and the second body are arranged in parallel with the interval between the hinge segments being decreased, characterised in that the flexible display device further comprises: a rear plate (231, 331) coupled to a rear surface of the flexible display unit, and configured to support the flexible display unit, wherein the rear plate includes: mounting portions (233a, 333a, 333a') extended in one direction, and recessed to couple the rear surface of the flexible display unit; and a bending supporting portion (234, 334) extended towards the outside from both sides of the mounting portions, wherein the bending supporting portion (234, 334) is concaved downward, and wherein a metallic supporting member is coupled to a bottom surface of the bending supporting portion (234, 334), in correspondence to a shape of the bottom surface. a rear plate (231, 331) coupled to a rear surface of the flexible display unit, and configured to support the flexible display unit, wherein the rear plate includes: mounting portions (233a, 333a, 333a') extended in one direction, and recessed to couple the rear surface of the flexible display unit; and a bending supporting portion (234, 334) extended towards the outside from both sides of the mounting portions, wherein the bending supporting portion (234, 334) is concaved downward, and wherein a metallic supporting member is coupled to a bottom surface of the bending supporting portion (234, 334), in correspondence to a shape of the bottom surface. mounting portions (233a, 333a, 333a') extended in one direction, and recessed to couple the rear surface of the flexible display unit; and a bending supporting portion (234, 334) extended towards the outside from both sides of the mounting portions, wherein the bending supporting portion (234, 334) is concaved downward, and wherein a metallic supporting member is coupled to a bottom surface of the bending supporting portion (234, 334), in correspondence to a shape of the bottom surface.