An electronic device is disclosed, including a hinge connecting to first and second housings as to enable foldability, a flexible display spanning at least a portion of the first housing and the second housing, wherein the flexible display is foldable and unfoldable along with folding and unfolding of the first and second housings, a first sealing member extending as to be disposed between an inner surface of the first housing, an inner surface of the second housing, and an outer surface of the flexible display and an elastic support member disposed between a portion of the flexible display, a portion of the inner surface of the first housing, and a portion of the inner surface of the second housing, within a folding area in which the first housing and the second housing are foldable and unfoldable.