A rotor includes a rotor body, first to third cover members, and first and second mounting brackets. The rotor body includes a tubular member and first and second rotor arms. The first and second rotor arms extend forward from first and second sides of the rear end of the tubular member. The rotor arms are also spaced apart from the outer periphery of the tubular member. The first and second cover members cover a portion of the outside of the first and second rotor arms. The third cover member is coupled to the rear ends of the first and second cover members, and covers the rear end of the tubular member. The first and second mounting brackets are disposed in front of the third cover member so as to be covered by the first and second cover members. The first and second mounting brackets are used for mounting the third cover member to the rotor body by way of screw members.