Patent ID: 8461834

Claim:
A magneto-impedance sensor element comprising: a substrate formed of a non-magnetic material; a planar pattern formed of a plurality of first conductive films arranged on a flat surface of the substrate; an amorphous wire arranged along an aligning direction of the planar pattern so as to traverse the plurality of first conductive films, the amorphous wire having a circular section perpendicular to an axis line of the amorphous wire; an insulator that covers an outer peripheral surface of the amorphous wire and fixes the amorphous wire on the planar pattern; and a cubic pattern that is formed over an outer surface of the insulator and a surface of the planar pattern and formed of a plurality of second conductive films arranged so as to traverse the amorphous wire, wherein the planar pattern and the cubic pattern are formed such that a laminated junction portion obtained by jointing an end portion of the first conductive film and an end portion of the second conductive film to each other in a laminated state is formed on each of both sides of the amorphous wire on a flat surface of the substrate to form a detecting coil obtained by integrating the planar pattern and the cubic pattern around the insulator, and the insulator has a shape in which a width in a direction parallel to the planar pattern increases toward the planar pattern on a section perpendicular to an axis line of the amorphous wire.