A foldable display apparatus includes: a foldable display panel having a folding portion about which display panel is configured to fold; a lower film on one surface of the display panel having two, spaced bumps disposed adjacent to and at opposite sides of the folding portion; and a sub-layer disposed on the lower film, wherein the folding portion is configured to fold so that the display panel faces exteriorly of the display panel and the sub-layer faces interiorly of the display panel, and wherein a sum of heights of the two bumps is approximately less than or equal to a sum of thicknesses of the two sub-layers at respective sides adjacent to the folding portion.