Resolver rotor and resolver

A resolver rotor being a resolver rotor of a resolver that detects a rotation angle of a rotating part of a target rotary electric machine, the resolver rotor comprising:

• a resolver rotor core that is mounted on a radially outer side of a rotor shaft of the target rotary electric machine and includes a plurality of resolver rotor plates stacked in an axial direction of the rotor shaft;
• and
• a resolver rotor core holder that holds relative positions of the resolver rotor core in a circumferential direction and the axial direction to the rotor shaft, wherein
• the resolver rotor core holder includes:
• an annular flat plate portion;
• a first constraining portion that is formed to protrude from an inner edge side of the flat plate portion with being sandwiched between two groove portions formed in the inner edge side of the flat plate portion, holds a relative position of the resolver rotor core holder to the rotor shaft, and holds an angle of the resolver rotor core in the circumferential direction relative to the rotor shaft;
• a second constraining portion that is formed to protrude from an inner edge side of the flat plate portion with being sandwiched between two groove portions formed in the inner edge side of the flat plate portion and holds a relative position of the resolver rotor core holder to the rotor shaft;
• and
• a third constraining portion that is formed on an inner edge side of the flat plate portion and holds a relative position of the resolver rotor core in the axial direction to the rotor shaft, and
• the resolver rotor core includes a radially inside recessed portion formed in an inner edge portion to engage with the first constraining portion.