Patent ID: 7564238

Claim:
A magnetic detection device comprising: a magnetic detection element using a magnetoresistance effect in which an electric resistance varies in accordance with an external magnetic field; and a detection circuit which detects a variation in an electrical resistance of the magnetic detection element, wherein the detection circuit having an interconnection layer is formed on a substrate and the detection circuit and the substrate are covered with an insulating layer, wherein the insulating layer is formed in an order of an insulating passivation layer, a resist layer and an insulating coating layer from the bottom, wherein the insulating passivation layer extends from the detection circuit to the substrate and having a hole extending from a portion of the interconnection layer, and the resist layer overlaps the insulating passivation layer and has the hole at locations facing the hole formed on the insulating passivation layer in a film thickness direction, thereby eliminating a step in the insulating passivation layer resulting from a level difference between the substrate and the detection circuit, wherein the resist layer extends to the interconnection layer via the insulating passivation layer and a lower edge portion of a hole formation surface on the resist layer is disposed on the insulating passivation layer to prevent the resist layer from directly contacting an upper surface of the interconnection layer, wherein the magnetic detection element is formed on the surface of the insulating coating layer, a conductive connection layer connected to the magnetic detection element passes through the hole and extends to an exposed surface of the interconnection layer, and the magnetic detection element and the interconnection layer are conductively connected through the connection layer.