Power steering torque sensor of the present invention, the vehicle is arranged between an output shaft connected to a wheel side of the input shaft and the car is connected to the steering wheel side, the power steering torque detecting a torsion generated by rotational manipulation of the steering wheel a sensor, said input shaft and said output being coupled to either the shaft portion so as to have the same radius from the center of magnetic force is a plurality of N poles mageuneteugwa S-pole magnet alternately arranged along the outer peripheral surface occurs; The input shaft and is connected to the other of the output shaft, in the form of a cylinder in the circumferential direction are formed spaced apart by an alternating arrangement interval of the plurality of N pole magnets and the S pole magnet circumferential direction of the N pole magnet and the S pole magnet self screening unit is a plurality of screening an open window formed having a width less than the width; Magnetic detection guiding portion for guiding said magnetic screening being disposed spaced by a fixed portion and a radially outer circumferential surface, detecting a plurality of magnetic force passing through the screening open windows right; And a fixed location on the outer peripheral side of the magnetic detecting guide portion the magnetic force generating part and the magnetic self-detecting to detect a relative twist changes between screening unit sensor portion; wherein a, is the magnetic field detection guiding portion: wherein the screening open windows in the outer periphery formed and, when the magnetic projection in the radial direction relative to the screening portion, at least some are intersecting with the screening open windows, the first magnetic detecting induction for inducing a magnetic force detected by the open window passes through the screening member; And the first spaced apart arrangement on the lower side of the magnetic detecting induction member and the second magnetic detecting induction member that is the subject compared to the screening window when projected in a radial direction relative to the screening portion difference; the power steering torque, characterized in that it comprises a It provides the sensor.