PROTECTIVE COVER HAVING SENSOR HOLDER PART, BEARING DEVICE INCLUDING THE PROTECTIVE COVER, AND METHOD FOR MANUFACTURING PROTECTIVE COVER HAVING SENSOR HOLDER PART

The present invention is intended to provide a protective cover having a reliable sensor holder part that prevents reduction in air tightness and strength of a division wall between a magnetic sensor and a magnetic encoder. A protective cover 1 is press-fitted into an outer ring to seal one axial end portion of a bearing, and has a sensor holder part 3B holding a magnetic sensor A. In the protective cover, a disc-shaped member 3 has a thick part 6 as a flow path for preferentially charging a molten resin into a thin part for forming a division wall B in a cavity of a molding die for use in injection molding between a position corresponding to a gate of the molding die and the division wall.