Patent ID: 7355382

Claim:
A current sensor comprising: first and fourth magnetoresistive elements which are placed on a mounting substrate, and have magnetoresistive characteristics of increasing resistances in accordance with increases in magnetic fields opposite in directions to each other; second and third magnetoresistive elements which are placed on the mounting substrate, and have magnetoresistive characteristics of reducing resistances in accordance with increases of the magnetic fields opposite in directions to each other; and connecting current lines, which are placed on the mounting substrate, and construct a bridge circuit including a first half bridge circuit and a second half bridge circuit by connecting said first to fourth magnetoresistive elements, said first half bridge circuit including said first and second magnetoresistive elements, and said second half bridge circuit including said third and fourth magnetoresistive elements, wherein said first half bridge circuit is placed in a first region of two regions formed by dividing said mounting substrate by a center line, said second half bridge circuit is placed in a second region of the two regions, and said first and second half bridge circuits are equally formed and placed point symmetrically with respect to a central point of the mounting substrate.