PURPOSE: A rotary angular sensor equipped with a magnetic material is provided to easily sense magnetic force at a hall device with permanent magnet whose magnetic force is weak because magnetic field is reached through the hall device to a magnetic material. CONSTITUTION: A rotary angular sensor equipped with a magnetic material comprises: a rotator(2) which is combined with a rotation object; a rotating shaft(4) which is connected to the one end of the rotator; a permanent magnet(6) which is installed to the rotating shaft and rotates; a printed circuit board(7) which includes a hole device which detects the changing of a magnetic field of the permanent magnet; and a magnetic material(50) which is placed on the other side of the printed circuit board and increases magnetic force of the permanent magnet.
