A vehicle comprising a vehicle body, opposite sliding doors and a device for operating the opposite sliding doors, the device comprising for each of the opposite sliding doors: a center rail mounted at a center inside the door in a longitudinal direction of the vehicle body, a center roller mounted on the vehicle body so as to correspond to the center rail, the center roller configured to move the center rail by being coupled to the center rail when the door is opened or closed as a center bearing unit formed at one side of the center roller is seated on the center rail, wherein the center roller has a center shaft formed at a position spaced apart from the center bearing unit such that the center shaft can rotate the center roller; a lower rail mounted at a lower side of the vehicle body in the longitudinal direction of the vehicle body; and a lower roller mounted at a lower side inside the door so as to correspond to the lower rail, the lower roller configured to move along the lower rail by being coupled to the lower rail when the door is opened or closed as a lower bearing unit formed at one side of the lower roller is seated on the lower rail, wherein the lower roller has a lower shaft formed at a position spaced apart from the lower bearing unit such that the lower shaft can rotate the lower roller, characterized in that the center rail is formed in a curved shape so that the door moves to the outside of the vehicle interior when the door is opened; wherein the lower rail is formed in a curved shape so that the door moves inside the vehicle when the door is closed; wherein the center roller further comprises: a center fixing unit that has one side which is mounted on the vehicle body to fix the center roller to the vehicle body, and another side that is bent at a predetermined angle and at which the center shaft is formed; and a center rotation unit that has one end which is connected to the center fixing unit so as to be pivotable about the center shaft, and another end at which the center bearing unit is mounted, characterized in that the center roller further comprises a center rotation restriction unit that is connected to the center fixing unit so as to be pivotable about the center shaft and mounted at a lateral side of the center rotation unit to restrict a rotation angle of the center rotation unit when the door is opened or closed, a center rail mounted at a center inside the door in a longitudinal direction of the vehicle body, a center roller mounted on the vehicle body so as to correspond to the center rail, the center roller configured to move the center rail by being coupled to the center rail when the door is opened or closed as a center bearing unit formed at one side of the center roller is seated on the center rail, wherein the center roller has a center shaft formed at a position spaced apart from the center bearing unit such that the center shaft can rotate the center roller; a lower rail mounted at a lower side of the vehicle body in the longitudinal direction of the vehicle body; and a lower roller mounted at a lower side inside the door so as to correspond to the lower rail, the lower roller configured to move along the lower rail by being coupled to the lower rail when the door is opened or closed as a lower bearing unit formed at one side of the lower roller is seated on the lower rail, wherein the lower roller has a lower shaft formed at a position spaced apart from the lower bearing unit such that the lower shaft can rotate the lower roller, characterized in that the center rail is formed in a curved shape so that the door moves to the outside of the vehicle interior when the door is opened; wherein the center roller further comprises: a center fixing unit that has one side which is mounted on the vehicle body to fix the center roller to the vehicle body, and another side that is bent at a predetermined angle and at which the center shaft is formed; and a center rotation unit that has one end which is connected to the center fixing unit so as to be pivotable about the center shaft, and another end at which the center bearing unit is mounted, a center fixing unit that has one side which is mounted on the vehicle body to fix the center roller to the vehicle body, and another side that is bent at a predetermined angle and at which the center shaft is formed; and a center rotation unit that has one end which is connected to the center fixing unit so as to be pivotable about the center shaft, and another end at which the center bearing unit is mounted, characterized in that the center roller further comprises a center rotation restriction unit that is connected to the center fixing unit so as to be pivotable about the center shaft and mounted at a lateral side of the center rotation unit to restrict a rotation angle of the center rotation unit when the door is opened or closed,