A VR resolver comprises a resolver stator and a resolver rotor. Teeth whose number is equal to the product of an integer P of 2 or more and 4 are arranged in an annular shape from the inner circumferential side to the inner side in the diameter direction of the resolver stator. In the resolver rotor, convex portions whose number is equal to the product of an odd number m of 3 or more and the integer P are radially projected. All the stator slots are provided with excitation coils which generate a magnetic field by the application of a voltage. Moreover, all the stator slots are provided with either a first coil or a second coil which outputs electric signals of different waveforms based on the magnetic field.