Abstract: The present invention realizes an improvement in the moldability of a resin portion that is injection-molded to an annular stator. A plurality of collar portions formed integrally with a peripheral edge of the insulating cover so as to project beyond the outer diameter of the annular stator, and a resin pin molded integrally with one of the collar portions, wherein a collar resin portion of the collar portion and a resin pin resin portion of the resin pin are integrated with each other when seen from above, and a first outer diameter of the collar resin portion is larger than a second outer diameter of the resin pin resin portion.