A flexible display device including a first body; a second body; a flexible display unit arranged on a front 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. Further, 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.