Abstract: Center bridges connecting an inner-circumferential-side core part and an outer-circumferential-side core part are provided so as to divide magnet insertion holes in which magnets forming one pole are inserted, into a plurality of parts in the circumferential direction. Each center bridge is formed in parallel with and line-symmetrically about a pole axis, and in connection portions respectively connected to the inner-circumferential-side core part and the outer-circumferential-side core part, border portions with respect to the magnet insertion holes are formed in an elliptic arc shape having a major axis parallel with the pole axis or in a curved shape obtained by smoothly connecting a plurality of circular arcs of which radiuses of curvature sequentially decrease toward the outer circumference of a rotor core.