Brushless resolver comprises exciting signal transmitting means for transmitting a resolver exciting signal from the stator side to the rotor side in a non-contact way and a resolver part for modulating the resolver exciting signal according to the angle of rotation to be detected. The resolver part also serves as exciting signal transmitting means. The resolver part is constituted of a pair of a rotor composed of a rotor iron core having slots and wrapped with a rotor winding and a stator composed of a stator iron core having slots and wrapped with a stator winding.