A foldable display including a first bracket, a second bracket, a rotating shaft connecting the first and the second brackets, at least one third bracket screwed to the rotating shaft, a fourth bracket movably coupled to the second and the third brackets, a flexible display disposed on the first and the fourth brackets, and a flexible supporting member disposed on the flexible display to be bent or flattened along with the flexible display is provided. The rotation of the rotating shaft drives the fourth bracket via the third bracket to move relative to the second bracket. The flexible supporting member is filled in a space composed of the fourth bracket, the second bracket, the first bracket, and the flexible display. A portable electronic device is also disclosed.