A flexible display device includes a display panel configured to display images, a first substrate having a plurality of pixels disposed therein, and a second substrate coupled to the first substrate. The first substrate includes a display area, a bent part extending from the display area, and a pad part extending from the bent part. The flexible display device further includes a panel driver coupled to the pad part of the first substrate and configured to supply signals to the plurality of pixels on the display panel for displaying images. The first substrate further includes a first surface and a second surface, and the second substrate includes a third surface and a fourth surface. The first surface of the first substrate faces the fourth surface of the second substrate. The first substrate is curved at the bent part of the first substrate such that the pad part of the first substrate and the panel driver are disposed below the display area.