Conventionally, as an AC generator for a vehicle, there is known the one which employs a Lundell-type rotor including a pair of claw-like magnetic poles axially supported by an intermediate portion of a shaft (for example, see Patent Literature 1).
In the rotor, a slip ring device including a molded-body main body formed by molding, which retains a first ring and a second ring disposed coaxially so as to be separated away from each other in an insulated fashion, is press-fitted over a distal end portion of the shaft.
On the other hand, in the case where a molded body including the molded-body main body is formed by molding, a weld line is generated when branch flows of a melted resin meet inside a die. In order to minimize the generation of the weld line, measures to increase temperatures of the melted resin and the die and to increase an injection pressure are taken (for example, see Patent Literature 2).