A flexible display device includes a flexible display module including a flexible display panel; a first frame and a second frame supporting the flexible display module; and a fixing coupler and an aligning coupler coupling the flexible display module with the first frame and the second frame, and the fixing coupler includes: a first fixing coupler fixing at least a portion of the first frame and at least a portion of the flexible display module; and a second fixing coupler fixing at least a portion of the second frame and at least a portion of the flexible display module, and the aligning coupler includes: a first aligning coupler fixed to another portion of the flexible display module; and a second aligning coupler fixed to another portion of the first frame and detachably coupled to the first aligning coupler.