As illustrated in FIGS. 8 and 10, the stator 30 has an annular fixing member 35 that covers the protruding piece 33b on the core back 31a from above. The fixing member 35 is a stepped ring that has an annular protruding portion 35a that is arranged along an outer circumferential side of a lower surface and protrudes to the lower side. The fixing member 35 is arranged on the core back 31a with the annular protruding portion 35a located on the upper surface 132 of the protruding piece 33b.

The fixing member 35 comes into contact with the upper surface 132 of the protruding piece 33b at a lower surface portion 135 of the annular protruding portion 35a. In addition, the fixing member 35 comes into contact with the upper surface 130 of the claw portion 33c on a lower surface 137 located on the inner side of the annular protruding portion 35a. A circumferential surface portion 136 facing the inner side in the radial direction of the annular protruding portion 35a opposes the surface 131 facing the outer side in the radial direction of the claw portion 33c in the radial direction.