A brake fluid pressure supply unit includes a fluid pressure generation device in which a piston that slides in a cylinder is driven by an electric motor to generate fluid pressure in a fluid pressure chamber formed in the cylinder; and a housing in which a fluid path connected to the fluid pressure chamber is formed. The electric motor and the cylinder are both attached to the housing. The electric motor is positioned more on upper side of the brake fluid pressure supply unit than the cylinder in a vertical direction. Thus, even if fluid leaks from the cylinder, the fluid having leaked can be prevented from entering inside of the electric motor. Thus, the operation of the electric motor is not impaired, whereby the reliability of the brake fluid pressure supply unit can be improved.