s 4 here as shown in fig1 the resin 230 which is in a flowing state is poured into the cavity 83 from a gate 84 that is formed near a contact surface between the first and second molds 81 and 82 the poured resin 230 spreads into the entire cavity 83 at this time radially inward pressure is applied to the wall portion 52 by the force of the flow of the resin 230 however when a portion of the wall portion 52 which is present below the tooth 42 in the axial direction is to collapse inward in the radial direction the inclined surface 522 of the wall portion 52 comes into contact with the wall supporting surface 951 of the first mold 81 accordingly the inward inclination of the wall portion 52 in the radial direction is suppressed a portion which is displaced most when receiving pressure from the resin 230 of the wall portion 52 below the tooth 42 in the axial direction is an axially lower end edge of the converging portion 521 in this embodiment at least the axially lower end edge of the converging portion 521 overlaps with the wall supporting surface 951 in the radial direction after the completion of the above mentioned step s 2 accordingly the inward displacement of the end edge in the radial direction is suppressed by the contact between the wall supporting surface 951 and the wall converging portion 521 accordingly the inward inclination of the wall portion 52 in the radial direction is further suppressed further in this embodiment the support protrusion 95 protrudes so as to have a substantially rectangular shape in top view or bottom view for this reason a contact portion between.