In a rotor for a vehicular alternating current generator, a field coil is wound around an insulating bobbin. A flange of the bobbin is formed with the first, second and third hook portions. A coil winding finishing end is wound around the first hook portion and is opposed to a winding direction of the field coil. The finishing end is then directed in a radially inward direction with the second hook portion, and extended further in the radially inward direction along the axial end surface of the flange. Then, the finishing end is directed in the axial direction with the third hook portion, radially inside of the outer peripheral end of the field coil. The finishing end forms an angle with itself of less than 90 degrees around the first hook portion when being viewed along an axial direction of the first hook portion.