A vehicle brake device comprising: a master cylinder that is operated by a brake pedal to generate brake fluid pressure, a stroke simulator into which can be introduced brake fluid from the master cylinder, a simulator valve disposed between the master cylinder and the stroke simulator, a fluid path (Pa to Pd; Qa to Qd) that provides a connection between the master cylinder and a wheel cylinder (26, 27; 30, 31), a slave cylinder that is connected to the fluid path (Pa to Pd; Qa to Qd) and generates brake fluid pressure by the driving force of an actuator, a master cut valve (32, 33) that is disposed in the fluid path (Pa to Pd, Qa to Qd) on an upstream side relative to the slave cylinder and can block the connection between the master cylinder and the wheel cylinder (26, 27; 30, 31), and a hydraulic modulator that is disposed in the fluid path (Pa to Pd, Qa to Qd) on a downstream side relative to the slave cylinder, the hydraulic modulator comprising: a hydraulic pump that can increase the pressure of the brake fluid of a reservoir and supply the brake fluid to the fluid path (Pa to Pd; Qa to Qd), an in-valve that is disposed between the slave cylinder and the wheel cylinder, and between the hydraulic pump and the wheel cylinder (26, 27; 30, 31), and an out-valve that is disposed between the wheel cylinder (26, 27; 30, 31) and the reservoir, characterised in that the device further comprises control means configurated in such a way that, when there is an abnormality of the slave cylinder, the control means closes the simulator valve and opens the master cut valve (32, 33), the in-valve, and the out-valve to thus enable the brake fluid to be transferred from the master cylinder to the reservoir. a master cylinder that is operated by a brake pedal to generate brake fluid pressure, a stroke simulator into which can be introduced brake fluid from the master cylinder, a simulator valve disposed between the master cylinder and the stroke simulator, a fluid path (Pa to Pd; Qa to Qd) that provides a connection between the master cylinder and a wheel cylinder (26, 27; 30, 31), a slave cylinder that is connected to the fluid path (Pa to Pd; Qa to Qd) and generates brake fluid pressure by the driving force of an actuator, a master cut valve (32, 33) that is disposed in the fluid path (Pa to Pd, Qa to Qd) on an upstream side relative to the slave cylinder and can block the connection between the master cylinder and the wheel cylinder (26, 27; 30, 31), and a hydraulic modulator that is disposed in the fluid path (Pa to Pd, Qa to Qd) on a downstream side relative to the slave cylinder, the hydraulic modulator comprising: a hydraulic pump that can increase the pressure of the brake fluid of a reservoir and supply the brake fluid to the fluid path (Pa to Pd; Qa to Qd), an in-valve that is disposed between the slave cylinder and the wheel cylinder, and between the hydraulic pump and the wheel cylinder (26, 27; 30, 31), and an out-valve that is disposed between the wheel cylinder (26, 27; 30, 31) and the reservoir, characterised in that the device further comprises control means configurated in such a way that, when there is an abnormality of the slave cylinder, the control means closes the simulator valve and opens the master cut valve (32, 33), the in-valve, and the out-valve to thus enable the brake fluid to be transferred from the master cylinder to the reservoir. a hydraulic pump that can increase the pressure of the brake fluid of a reservoir and supply the brake fluid to the fluid path (Pa to Pd; Qa to Qd), an in-valve that is disposed between the slave cylinder and the wheel cylinder, and between the hydraulic pump and the wheel cylinder (26, 27; 30, 31), and an out-valve that is disposed between the wheel cylinder (26, 27; 30, 31) and the reservoir, characterised in that the device further comprises control means configurated in such a way that, when there is an abnormality of the slave cylinder, the control means closes the simulator valve and opens the master cut valve (32, 33), the in-valve, and the out-valve to thus enable the brake fluid to be transferred from the master cylinder to the reservoir.