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A rotor (2) comprises : radially magnetized rare earth magnets; a rotor core (7); and thermally conductive sheets (13) each formed of a deformable material. The rotor core (7) includes : first parts (71); thin wall parts (73) each including a second part (72) harder than the first part; and magnet insertion holes (12). The thin wall parts (73) are located between the outer edge of the rotor core (7) and circumferential end regions of the respective magnet insertion holes (12).