A door opening-and-closing apparatus for a vehicle, comprising: a driving unit adapted to be fixed at a vehicle door for opening and closing a door opening formed at a vehicle body and having a driving source, a drum, which is rotatably driven by the driving source, and a cable (24, 25 / 61, 62), which is wound around the drum, the cable (24, 25 / 61, 62), whose first and second end portions are connected to the vehicle body; a rotating shaft (32 / 52) adapted to be fixed at the vehicle door; a first pulley (33 / 53) supported by the rotating shaft (32 / 52) so as to be rotatable thereabout and having a first guide groove, within which one of the first and second end portions of the cable (24, 25 / 61, 62), which is reeled in and reeled out from the drum, is engaged in order to guide the one of the first and second end portions to be connected to the vehicle body; and a second pulley (34 / 54) supported by the rotating shaft (33 / 53) so as to be rotatable thereabout, and having a second guide groove, within which the other one of the first and second end portions of the cable (24, 25 / 61, 62), which is reeled in and reeled out from the drum, is engaged in order to guide the other one of the first and second end portions to be connected to the vehicle body, characterized in that the rotating shaft (32 / 52) extends in a vehicle width direction; the second pulley (34 / 54) is arranged in parallel with the first pulley (33 / 53) in the vehicle width direction; wherein an attachment member (31 / 41) is adapted to be fixed on the vehicle door and supports the rotating shaft (32 / 52), wherein the first and second pulleys (33, 34 / 53, 54) are rotatably provided on the attachment member (31 / 41) in a state where the first and second pulleys (33, 34 / 53, 54) are placed on one another in an axial direction of the rotating shaft (32 / 52) while a predetermined surface of the first pulley (33 / 53) faces a predetermined surface of the second pulley (34 / 54), a protruding portion is provided at one of the first and second pulleys (33, 34 / 53, 54) so as to extend over a contact surface extended line towards the other one of the first and second pulleys (33, 34 / 53, 54) in the axial direction, and an annular recessed portion is formed at the other one of the first and second pulleys (33, 34 / 53, 54) so that the protruding portion is inserted to the annular recessed portion while forming a clearance therebetween and so that a relative rotation between the first and second pulleys (33, 34 / 53, 54) is allowed. a driving unit adapted to be fixed at a vehicle door for opening and closing a door opening formed at a vehicle body and having a driving source, a drum, which is rotatably driven by the driving source, and a cable (24, 25 / 61, 62), which is wound around the drum, the cable (24, 25 / 61, 62), whose first and second end portions are connected to the vehicle body; a rotating shaft (32 / 52) adapted to be fixed at the vehicle door; a first pulley (33 / 53) supported by the rotating shaft (32 / 52) so as to be rotatable thereabout and having a first guide groove, within which one of the first and second end portions of the cable (24, 25 / 61, 62), which is reeled in and reeled out from the drum, is engaged in order to guide the one of the first and second end portions to be connected to the vehicle body; and a second pulley (34 / 54) supported by the rotating shaft (33 / 53) so as to be rotatable thereabout, and having a second guide groove, within which the other one of the first and second end portions of the cable (24, 25 / 61, 62), which is reeled in and reeled out from the drum, is engaged in order to guide the other one of the first and second end portions to be connected to the vehicle body, characterized in that the rotating shaft (32 / 52) extends in a vehicle width direction; the second pulley (34 / 54) is arranged in parallel with the first pulley (33 / 53) in the vehicle width direction; wherein an attachment member (31 / 41) is adapted to be fixed on the vehicle door and supports the rotating shaft (32 / 52), wherein the first and second pulleys (33, 34 / 53, 54) are rotatably provided on the attachment member (31 / 41) in a state where the first and second pulleys (33, 34 / 53, 54) are placed on one another in an axial direction of the rotating shaft (32 / 52) while a predetermined surface of the first pulley (33 / 53) faces a predetermined surface of the second pulley (34 / 54), a protruding portion is provided at one of the first and second pulleys (33, 34 / 53, 54) so as to extend over a contact surface extended line towards the other one of the first and second pulleys (33, 34 / 53, 54) in the axial direction, and an annular recessed portion is formed at the other one of the first and second pulleys (33, 34 / 53, 54) so that the protruding portion is inserted to the annular recessed portion while forming a clearance therebetween and so that a relative rotation between the first and second pulleys (33, 34 / 53, 54) is allowed.