A brake device for a vehicle, comprising: a master cylinder for generating a hydraulic pressure in response to an operation by a driver on a brake pedal; a power hydraulic pressure source for generating a hydraulic pressure through drive of a pressure pump; a valve mechanism comprising a plurality of electromagnetic valves (61, 62, 63, 64, 72) to be controlled by electric signals, for carrying out transmission of the hydraulic pressure output from the master cylinder or the power hydraulic pressure source; a wheel cylinder (42FR, 42 FL, 42 RR, 42RL) for applying a braking force to a wheel through the transmission of the hydraulic pressure output from the master cylinder or the power hydraulic pressure source via the valve mechanism; and an electromagnetic valve drive circuit for supplying electric power from an electric power storage device installed on the vehicle, for operations of the plurality of electromagnetic valves (61, 62, 63, 64, 72) constructing the valve mechanism, characterized in that: the electromagnetic valve drive circuit is configured to limit the plurality of electromagnetic valves (61, 62, 63, 64, 72) constructing the valve mechanism to a specific electromagnetic valve (63,64,72) that carries out the transmission of the hydraulic pressure mechanically generated by the master cylinder in response to the operation on the brake pedal, to thereby secure backup electric power for backing up an operation of the limited specific electromagnetic valve (63,64,72) independently of the electric power to be supplied from the electric power storage device. a master cylinder for generating a hydraulic pressure in response to an operation by a driver on a brake pedal; a power hydraulic pressure source for generating a hydraulic pressure through drive of a pressure pump; a valve mechanism comprising a plurality of electromagnetic valves (61, 62, 63, 64, 72) to be controlled by electric signals, for carrying out transmission of the hydraulic pressure output from the master cylinder or the power hydraulic pressure source; a wheel cylinder (42FR, 42 FL, 42 RR, 42RL) for applying a braking force to a wheel through the transmission of the hydraulic pressure output from the master cylinder or the power hydraulic pressure source via the valve mechanism; and an electromagnetic valve drive circuit for supplying electric power from an electric power storage device installed on the vehicle, for operations of the plurality of electromagnetic valves (61, 62, 63, 64, 72) constructing the valve mechanism, characterized in that: the electromagnetic valve drive circuit is configured to limit the plurality of electromagnetic valves (61, 62, 63, 64, 72) constructing the valve mechanism to a specific electromagnetic valve (63,64,72) that carries out the transmission of the hydraulic pressure mechanically generated by the master cylinder in response to the operation on the brake pedal, to thereby secure backup electric power for backing up an operation of the limited specific electromagnetic valve (63,64,72) independently of the electric power to be supplied from the electric power storage device. the electromagnetic valve drive circuit is configured to limit the plurality of electromagnetic valves (61, 62, 63, 64, 72) constructing the valve mechanism to a specific electromagnetic valve (63,64,72) that carries out the transmission of the hydraulic pressure mechanically generated by the master cylinder in response to the operation on the brake pedal, to thereby secure backup electric power for backing up an operation of the limited specific electromagnetic valve (63,64,72) independently of the electric power to be supplied from the electric power storage device.