Patent ID: 7098651

Claim:
A rotation detection sensor sensing a change in a magnetic field caused by rotation of an object to be detected, so as to detect the rotation of the object, comprising: a capped tubular casing; a detection unit placed in said capped tubular casing to detect the magnetic field; a holder having an outer peripheral portion fit in an opening edge of said capped tubular casing and being placed to have a projecting portion projecting from said opening edge; a synthetic-rubber-based solvent-type sealing material formed entirely along an outer peripheral surface, at least at said opening edge, of said capped tubular casing; a resin portion entirely covering the projecting portion of said holder, said opening edge of said capped tubular casing and said synthetic-rubber-based solvent-type sealing material, and continuously extending from the projecting portion of said holder to said opening edge of said capped tubular casing; an outward flange provided to said opening edge of said capped tubular casing; and a groove provided entirely along the projecting portion of said holder that abuts on said opening edge of said capped tubular casing, wherein said synthetic-rubber-based solvent-type sealing material is formed entirely along said flange and the projecting portion of said holder to extend from the projecting portion of said holder to said flange, said synthetic-rubber-based solvent-type sealing material fills said groove entirely along said groove and the projecting portion of said holder to extend from the projecting portion of said holder to said groove, and the groove is formed between an inner peripheral portion of the opening edge of the capped tubular casing and an outer peripheral portion of the projecting portion of the holder.