A brake fluid pressure control apparatus in a skid control system for a vehicle includes a fluid pressure control valve arranged between a master cylinder and a wheel brake operating apparatus; a brake relieving circuit connected to the fluid pressure control valve; a hydraulic reservoir for reserving brake fluid discharged through the fluid pressure control valve and the brake relieving circuit from the wheel brake operating apparatus and a fluid pressure pump for pressurizing brake fluid from the hydraulic reservoir for returning the brake fluid into a pressurized fluid supply conduit connecting the master cylinder with the fluid pressure control valve through a brake fluid returning circuit; and a valve apparatus arranged at the side of the master cylinder with respect to the connecting point between the pressurized fluid supply conduit and the brake fluid returning circuit, in the pressurized fluid supply conduit, the valve apparatus being able at least to cut off the fluid communication in the direction extending from the connecting point towards the master cylinder and a throttle in a conduit connecting the input side of the valve apparatus and the output side thereof.