A brake device having an antilock controller comprising a hydraulic pump which is reciprocated through a cam by an output shaft responsive to rotation of a wheel to produce a hydraulic pressure for controlling a braking pressure of the wheel, and a sensor which senses, by the overrunning rotation of a flywheel, the situation that the locking of the wheel is restored when the wheel is braked, to produce a signal, wherein the cam of the hydraulic pump and the flywheel of the sensor are arranged adjacent to each other on the output shaft within a hub of the wheel.