A vehicle door opening device in which a door is supported on a vehicle body to open and close by a motor, the device comprising: a center guide rail fixed, in use, to the vehicle body; a moving member supported on the center guide rail to move and connected, in use, to the door; a closing reversible member disposed under a lower surface of the center guide rail at one end of the center guide rail; an opening reversible member disposed on an uppermost top surface of the center guide rail at the other end of the center guide rail; a closing cable wound around the closing reversible member and coupled to a closing coupling portion of the moving member to transmit rotation of the motor as door-closing force to the moving member; and an opening cable wound around the opening reversible member and coupled to a opening coupling portion of the moving member to transmit rotation of the motor as door-opening force to the moving member, whereby the closing coupling portion is provided at a lower part of the moving member; whereby the opening coupling portion is provided at an upper part of the moving member; whereby the closing cable moves along the lower surface of the center guide rail; and whereby the opening cable moves above the uppermost top surface of the center guide rail along the center guide rail; wherein the closing reversible member and the opening reversible member are spaced from each other in a direction perpendicular to a moving direction of the moving member, and wherein the closing coupling portion and the opening coupling portion are spaced from each other in a direction perpendicular to the moving direction of the moving member outside the center guide rail. a center guide rail fixed, in use, to the vehicle body; a moving member supported on the center guide rail to move and connected, in use, to the door; a closing reversible member disposed under a lower surface of the center guide rail at one end of the center guide rail; an opening reversible member disposed on an uppermost top surface of the center guide rail at the other end of the center guide rail; a closing cable wound around the closing reversible member and coupled to a closing coupling portion of the moving member to transmit rotation of the motor as door-closing force to the moving member; and an opening cable wound around the opening reversible member and coupled to a opening coupling portion of the moving member to transmit rotation of the motor as door-opening force to the moving member, whereby the closing coupling portion is provided at a lower part of the moving member; whereby the opening coupling portion is provided at an upper part of the moving member; whereby the closing cable moves along the lower surface of the center guide rail; and whereby the opening cable moves above the uppermost top surface of the center guide rail along the center guide rail; wherein the closing reversible member and the opening reversible member are spaced from each other in a direction perpendicular to a moving direction of the moving member, and wherein the closing coupling portion and the opening coupling portion are spaced from each other in a direction perpendicular to the moving direction of the moving member outside the center guide rail.