To provide a motor rotor capable of reducing oscillation and noise, improving reliability by reducing a deviance (deflection) in a rotating shaft, and reducing manufacturing cost.

This rotor is composed of a permanent magnet 4 having a protrusion 4a protruding inwardly to a cylindrical inner periphery, a rotor core 2 which is fitted onto the rotating shaft 3 provided on its central portion and has a whirl-stop 3a on an outer periphery, a buffering member 5 disposed at a space between the rotor core 2 and the permanent magnet 4, and having an inserting hole 5a at the center, a fitting groove 5b fitted with the whirl-stop 3a, a fitting groove 5c fitted on the protrusion 4a at the outer periphery, a flange 5z brought into contact with one end of the protrusion 4a of the permanent magnet 4, and a dropping-stop 5d inwardly protruding at another edge between the fitting groove 5c and the inserting hole 5a at the center; and a pair of end plates 6 disposed at the outer end of the buffering member 5. The protrusion 4a of the permanent magnet 4 is supported between the flange 5z of the buffering member 5 and the dropping-stop 5d thereof, and the end plates 6 are inserted into the rotating shaft 3 and tightly fixed from both ends thereof.