A vehicle door opening device opens and closes a door with a motor. In the vehicle door opening device, an opening reversible member on which an opening cable is wound is disposed on a top surface of a center guide rail, and a closing reversible member on which a closing cable is wound is disposed under a lower surface of the center guide rail. A moving member moves along the center guide rail and comprises a closing coupling portion to which the closing cable is coupled and an opening coupling portion to which the opening cable coupled. The closing cable moves along the lower surface of the center guide rail, and the opening cable moves along the top surface of the center guide rail.