When a brake switch (282) is switched from OFF to ON, current is applied to a brake ECU, and a command to switch a master cylinder from a second state to a first state is issued after a lapse of preparation time, so that switching-time change suppression control is performed. A reservoir shutoff valve (156) is closed, and duty control is performed on a communication control valve (152). The duty ratio is set to 1 when a switching-time control duration expires, and the communication control valve (152) is placed in an open position, to establish the first state. Thus, since the communication control valve (152) is duty-controlled during switching from the second state to the first state, change in the hydraulic pressure of an input chamber is suppressed, and change of the operating feeling is suppressed.