Brushless motor

PROBLEM TO BE SOLVED : To provide a brushless motor which can reduce the number of rotor magnets without degrading the rotating performance of a rotor and attain weight reduction and low moment of inertia. SOLUTION : A rotor yoke 6 is formed of a magnetic material with low magnetic resistance, and protruding parts 9a, 9b, 9c are fitted at the outer periphery of the rotor yoke 6 so as to be integrated with the rotor yoke 6 and positioned between rare earth magnets 8a, 8b, 8c. Hole parts 10a, 10b, 10c are fitted at the protruding parts 9a, 9b, 9c along the axial direction of the rotor yoke 6.