The present invention is intended to suppress a change in a braking force due to a change in the magnitude of friction of an internal combustion engine, in a regenerative control system for a vehicle in which kinetic energy of wheels is made to be converted (regenerated) to electrical energy, at the time of deceleration running of the vehicle with the internal combustion engine mounted thereon. In order to solve this subject, the present invention is constructed such that the change in friction of the internal combustion engine is offset by adjustment of a regenerative braking force by regulating an amount of excitation current supplied to an electric generator according to the magnitude of friction in the internal combustion engine, at the time of deceleration running of the vehicle.