Arrangement comprising a starting device being a torque converter or a frictional clutch device, a case enclosing the starting device and a brushless winding field rotational electric machine positioned between the starting device and the case, the rotational electric machine comprising: a stator, which is held to the case, including an alternating-current coil configured to generate a rotation magnetic field by alternating current; a field core, which is held to the case, including a field coil to be excited by direct current; and a rotor disposed on an outer periphery of the starting device and rotatably held about a rotational axis thereof relative to the stator and the field coil, wherein the rotor includes a connection portion to be connected to a synchronized rotation member connected to the starting device on an engine side thereof and configured to rotate in synchronization with an engine along the rotational axis, on a facing surface to the synchronized rotation member, the rotor comprises a first magnetic pole and a second magnetic pole, the first magnetic pole and the second magnetic pole are arranged without being in contact with each other, characterized in that the first magnetic pole includes a first circular ring portion and a plurality of claw portions each protruding from the first circular ring portion in an axial direction of the rotational axis, the second magnetic pole is disposed on an inner side of the first magnetic pole through a radial direction gap in a radial direction of the rotational axis and includes a second circular ring portion disposed partially overlapping the first magnetic pole and a plurality of convex portions each protruding from an outer peripheral surface of the second circular ring portion in the radial direction of the rotational axis and each having a circumferential direction gap in a circumferential direction of the rotational axis, each of the plurality of claw portions is inserted in the circumferential direction gap so that the claw portions and the convex portions are alternately arranged in the circumferential direction of the rotational axis, and the connection portion is disposed on the facing surface of the second circular ring portion and on the inner side of the convex portion in the radial direction of the rotational axis. a stator, which is held to the case, including an alternating-current coil configured to generate a rotation magnetic field by alternating current; a field core, which is held to the case, including a field coil to be excited by direct current; and a rotor disposed on an outer periphery of the starting device and rotatably held about a rotational axis thereof relative to the stator and the field coil, wherein the rotor includes a connection portion to be connected to a synchronized rotation member connected to the starting device on an engine side thereof and configured to rotate in synchronization with an engine along the rotational axis, on a facing surface to the synchronized rotation member, the rotor comprises a first magnetic pole and a second magnetic pole, the first magnetic pole and the second magnetic pole are arranged without being in contact with each other, characterized in that the first magnetic pole includes a first circular ring portion and a plurality of claw portions each protruding from the first circular ring portion in an axial direction of the rotational axis, the second magnetic pole is disposed on an inner side of the first magnetic pole through a radial direction gap in a radial direction of the rotational axis and includes a second circular ring portion disposed partially overlapping the first magnetic pole and a plurality of convex portions each protruding from an outer peripheral surface of the second circular ring portion in the radial direction of the rotational axis and each having a circumferential direction gap in a circumferential direction of the rotational axis, each of the plurality of claw portions is inserted in the circumferential direction gap so that the claw portions and the convex portions are alternately arranged in the circumferential direction of the rotational axis, and the connection portion is disposed on the facing surface of the second circular ring portion and on the inner side of the convex portion in the radial direction of the rotational axis.