Patent ID: 8258781

Claim:
A rotation detecting sensor fixed to a sensor fixing member to be fitted to a wheel support bearing assembly, for detecting rotation of a rotating ring of the wheel support bearing assembly, comprising: a sensor unit including a magnetic sensor element to detect an annular to-be-detected element provided coaxially with the rotating ring, a cable to extract there through an output signal of the magnetic sensor element to an outside, and a substrate having the magnetic sensor element and one end of the cable both mounted thereon and having a plurality of electroconductive pattern portions to electrically connecting an electrode portion of the sensor element and a core wire of the cable with each other, the sensor unit being fixed to the sensor fixing member through the substrate; and a molding segment molded of a molding material in a bonded condition with the substrate and is provided around the sensor unit, wherein the substrate is provided with a plurality of metallic pattern portions each in the form of a metallic coating on a substrate surface and forming a periphery of the plurality of electroconductive pattern portions, and the molding material is bonded to the plurality of metallic pattern portions, and the plurality of metallic pattern portions are positioned on respective opposite sides of the plurality of electroconductive pattern portions with respect to a direction of arrangement of the plurality of electroconductive pattern portions, each of the plurality of metallic pattern portions being in the form of an elongated stripe elongated in a direction perpendicular to the direction of arrangement of the plurality of electroconductive pattern portions, with the opposite ends thereof extending to respective end portions of the substrate.