A foldable display device can include a display panel including a folding area and a non-folding area; a rigid member disposed under the display panel, the rigid member including an opening pattern corresponding to the folding area; a support member disposed under the rigid member; and an adhesive member disposed between the support member and the rigid member, in which the adhesive member includes a non-adhesive portion disposed between the support member and the rigid member, the non-adhesive portion of the adhesive member overlaps with the opening pattern in the rigid member, and the non-adhesive portion of the adhesive member overlaps with the folding area of the display panel.