A brake fluid pressure controller for a vehicle having a brake system, a brake operation element and a master cylinder, the brake system including: a pump configured for being activated and increasing brake fluid pressure to provide braking force to a wheel brake of the other brake system in which the brake operation element is not operated; a cutoff valve which blocks an output fluid pressure passage leading from a master cylinder-side to a wheel brake-side when the pump is operated; a brake fluid pool disposed downstream of the cutoff valve and upstream of the pump; and a pressure member configured for being slidably moved by a brake fluid pressure generated on the master cylinder-side relative to the cutoff valve by an operation of the brake operation element and for providing pressure to a fluid pressure passage leading to the wheel brake.