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The sensor which is the indispensable element for the protection of the human being, the safety and the convenience has the faculty of the measurement measuring the physical and chemical quantity of every kinds in the role of a protection of a guard, the faculty of artificial sensation expanding and supplementing the control faculty to actualize the automatic industrial, and above all the perception faculty of the six sense superior to five senses. The sensor like this measures by accepting every signal from the external world and changes it into the convenient electric signal. When a solid of a metal or a semiconductor etc. in the magnetic field is put and an electric current in it at a right angle to the direction of magnetic field is sent, it is called as the hall voltage - a phenomenon that the electric field in it at a right angle to each direction appear the electric field. When the phenomenon that this hall voltage come out is called as the hall effect, the sensor using this phenomenon is called as the hall sensor.