BRAKE CONTROL DEVICE

PROBLEM TO BE SOLVED: To provide a brake control device that is configured to actuate a piston with an electric actuator to generate a fluid pressure in a master cylinder depending on the operation amount of a brake pedal, which facilitates control during regenerative cooperation.SOLUTION: In a brake control device, a master pressure control device 4 controls actuation of an electric motor 22 depending on an operation amount of a brake pedal 19, controls to drive a primary piston 8 and a fluid pressure is generated in the master cylinder 2 to be supplied to wheel cylinders Ba-Bd. The master pressure control device 4 sets a target relative displacement XT between an input piston 17 and the primary piston 8 and a target fluid pressure PT in the master cylinder 2, and controls a braking force by properly switching between the displacement XT and the target fluid pressure PT to be used. During regenerative cooperation, switching to a control using the target fluid pressure PT facilitates the fluid pressure control where a fluid pressure for regeneration is deducted.