A foldable display device (100, 200, 300, 400) comprising: a display panel having a first surface in which a display unit is positioned and a second surface opposite to the first surface and including a bendable region and two flat regions positioned at both sides of the bendable region; and a panel supporting unit facing the second surface and coupled to the display panel, wherein the panel supporting unit includes a plurality of link members arranged in parallel along a first direction one behind another corresponding to the bendable region of the display panel in an unfolded state, each of the plurality of link members respectively having a first supporting surface facing the display panel and coupled to be rotated about two rotational axes in a folded state, the panel supporting unit further includes two supporting plates corresponding to the two flat regions, each of the two supporting plates having a second supporting surface facing the display panel, and the two rotational axes of each of the plurality of link members are separated from the first supporting surface in a direction from the second surface toward the first surface characterized in that the foldable display device (100, 200, 300, 400) is configured to position the plurality of link members to the inside from the second surface of the bendable region in the direction toward an imaginary circular arc or a curvature center of the bendable region by a distance difference between a first distance and a second distance in the folded state, the first distance is a distance between the rotational axis and the first supporting surface, and the second distance is a distance between the rotational axis and the second supporting surface. a display panel having a first surface in which a display unit is positioned and a second surface opposite to the first surface and including a bendable region and two flat regions positioned at both sides of the bendable region; and a panel supporting unit facing the second surface and coupled to the display panel, wherein the panel supporting unit includes a plurality of link members arranged in parallel along a first direction one behind another corresponding to the bendable region of the display panel in an unfolded state, each of the plurality of link members respectively having a first supporting surface facing the display panel and coupled to be rotated about two rotational axes in a folded state, the panel supporting unit further includes two supporting plates corresponding to the two flat regions, each of the two supporting plates having a second supporting surface facing the display panel, and the two rotational axes of each of the plurality of link members are separated from the first supporting surface in a direction from the second surface toward the first surface characterized in that the foldable display device (100, 200, 300, 400) is configured to position the plurality of link members to the inside from the second surface of the bendable region in the direction toward an imaginary circular arc or a curvature center of the bendable region by a distance difference between a first distance and a second distance in the folded state, the first distance is a distance between the rotational axis and the first supporting surface, and the second distance is a distance between the rotational axis and the second supporting surface.