A foldable display device including a case that stably supports a flexible display panel for improving user convenience is disclosed. In one aspect, the foldable display device includes a flexible display panel including a foldable area between lateral plane areas thereof and a pair of front cases surrounding a front perimeter of the flexible display panel. The device also includes a pair of bottom cases coupled with the pair of front cases to house the flexible display panel and a biaxial hinge member mounted to the bottom case in the foldable area to connect the pair of front cases to respective rotation points.