BRAKE DEVICE

When a necessary braking force is generated, the drive of pump motors 34 and the non-drive of the pump motors 34 are switched by a hydraulic pressure controlling unit 79 in response to the relative magnitudes of the necessary braking force and a brake operation braking force as well as the flow of a brake fluid in the direction of a master cylinder 11 is reduced by master cut valves 31, thereby keeping a hydraulic pressure by which wheel cylinders 51 can generate the necessary braking force. With the operation, when the necessary braking force is generated, since the pump motors 34 are not driven at all times, the operation time of the pump motors 34 can be reduced. As a result, the load of the pump motors 34 can be reduced, and the durability of the pump motors 34 can be secured.