Braking device for vehicle

A braking device for a vehicle comprising:

• a reservoir;
• a first pressurizing unit including a cylinder, a piston slidable in the cylinder, an electric motor that drives the piston, and an output chamber partitioned by the cylinder and the piston and in which volume changes by movement of the piston, the first pressurizing unit being configured such that a connection state between the output chamber and the reservoir is switched between a communication state and a cut-off state according to a position of the piston, and the first pressurizing unit being capable of pressurizing fluid by decreasing a volume of the output chamber by movement of the piston to one side in an axial direction;
• a pressure sensor that detects a pressure of the output chamber;
• and
• an estimation unit that executes a position estimation process of moving the piston and estimating a switching position of the piston at which the connection state of the output chamber and the reservoir is switched based on a detection value of the pressure sensor.