To make a brake device generate a required braking force, a hydraulic control section switches, according to the relative magnitude between the required braking force and a braking force exerted by braking operation, between drive of a pump motor and non-drive of the pump motor and a master cut valve reduces the flow of brake fluid in the direction to a master cylinder. Sixty-four write control circuits are coupled to the 64 memory cells. A respective one of two transistors connected in parallel is driven by a positive component signal and a negative component signal in such a way that a positive half-wave causes the relevant transistor to conduct and the relevant transistor blocks in a negative half-wave. The ecology valve portion includes a housing with a movable piston disposed therein.