ROTOR STRUCTURE OF ROTATING ELECTRIC MACHINE

A rotor structure for a rotary electric machine in which an inner surface of a hollow rotor core 20 and an outer surface of a shaft 30 inserted into a hole of the rotor core 20 are fitted together by mutual engagement between a projection and a recess to compose a rotor 10, the rotor structure including: a first retainer 41 brought into contact with one end of the rotor core 20; and a second retainer 40 brought into contact with a surface of the first retainer 41 opposite to a surface in contact with the rotor core 20 so as to fix the first retainer 41 and the rotor core 20 to the shaft 30, wherein a coefficient of static friction of a first sliding surface 80 between the first retainer 41 and the second retainer 40 is smaller than any other sliding surface provided in the rotor 10.