The vehicle alternator comprises a rotor. The rotor comprises a first pole core 12, a second pole core 14, a field coil 13, and holders 15 each containing a magnet 16 and disposed between a first claw 123 and a second claw 143. The holder 15 consists of the magnet 16 inserted in a tubular member X having an opening x1/openings x2, and is formed with the tubular member X deformed so as to close the opening x1/openings x2.