A hinge structure including a first screw rod, a sliding rod, and a second screw rod is provided. The first screw rod comprises a threaded shaft. The sliding rod is sleeved on the threaded shaft. The second screw rod is sleeved on the sliding rod. The threaded shaft has a first helical slot. The sliding rod has a first guiding portion and a second guiding portion, and the first guiding portion is coupled to the first helical slot. The second screw rod has a second helical slot, and the second guiding portion is coupled to the second helical slot.