To provide a brake device capable of restraining reduction in durability of a pump.

A master cylinder 5 has a first liquid chamber 51 for generating hydraulic pressure by brake operation of a driver, and a second liquid chamber 52 communicated with a reservoir 4 and connected to a suction part 70 of the pump 7, and can create wheel cylinder hydraulic pressure by the hydraulic pressure of the first liquid chamber 51 in a state of communicating the suction part 70 of the pump 7 with the reservoir 4 via the second liquid chamber 52.