Patent ID: 7723984

Claim:
A current sensor of comprising: a conductor line generating a current magnetic field according to a supplied current to be detected; a pair of element substrates each including a magnetoresistive element disposed along with the conductor line; a pair of magnetic sheets each attached on one side of each of the element substrates, respectively, so as to apply a bias magnetic field to each of the magnetoresistive elements; a pair of constant current sources each supplying a constant current of a common magnitude to each of the magnetoresistive elements; and a difference detector detecting a difference in the voltage drops resulting from the constant current in each of the magnetoresistive elements, wherein the magnetoresistive elements in the element substrates are set so that a resistance value of one of the magnetoresistive elements changes in a direction opposite to that of resistance-value-change of the other magnetoresistive element according to the current magnetic field.