To provide a braking energy regenerating apparatus which regenerates kinetic energy of a vehicle in the state that an accelerator is released during vehicle running, applies it as electric energy to a battery for exclusive use of motor-operated brakes, and can operate the motor-operated brakes installed in wheels by using the electric energy when the brakes are operated.

A brake apparatus is equipped with motor-operated brakes IFR, IFL, IRR, IRL in the front and the rear wheels, which brakes are controlled by at least two independent systems. Batteries 4, 5 for exclusive use of motor- operated brakes for operating the motor-operated brakes are installed in the brake system. Generators 7, 8 are installed in at least one wheel in each brake system. When the state that an accelerator is opened is detected during running, the batteries 4, 5 for exclusive use of the motor-operated brakes are charged by electric power generated with the generators 7, 8.