A permanent magnet embedded rotor disposed coaxially with a cylindrical stator having a plurality of coils in the circumferential direction includes a rotor core that includes a columnar body made of a magnetic metal and a spacer made of a nonmagnetic material, and has an even number of insertion grooves, a cylindrical body that is made of a nonmagnetic metal with good electrical conductivity and externally inserted on the rotor core, permanent magnets embedded in the insertion grooves so that their N poles and S poles alternately come into contact with the inner peripheral surface of the cylindrical body, and a rotary shaft made of stainless steel fit into a rotation center of the rotor core.