The purpose of the present invention is to supply current to a motor in a full-energization state after the start of automatic brake control while minimizing an increase in starting current to the motor in the initial stage at the start of control. In the invention, the motor is controlled in a full-energization state so that the motor produces a higher output and a high braking force with high responsiveness is achieved, and high-frequency control is performed only during the startup so as to prevent the starting current from becoming excessive. This configuration is able to minimize a decrease in battery voltage and minimize malfunctioning of the control system of various on-board electrical components.
