An outer rotor type motor including a rotor in which magnets are arranged on an inner circumferential surface of a cylindrical rotor yoke , comprising: a motor shaft configured to rotatably support the rotor ; and a rotor attachment member including a base end extended from an outer periphery of the motor shaft outward in a radial direction and an outer end formed from an outer periphery of the base end outward in the radial direction, wherein the outer end is formed at a position close to the inner circumferential surface of the rotor yoke , as compared with an outer peripheral surface of the motor shaft , the rotor is attached to the outer end , the base end is formed so that a thickness in an axial direction of the motor shaft gradually decreases from the outer periphery of the motor shaft to the outer end that is radially outside, a step is formed between the base end and the outer end along the axial direction of the motor shaft , the rotor is attached to the outer end in a state in which an opening of the rotor yoke is fitted in the step , the outer rotor type motor further comprising a fan formed concentrically with the rotor yoke , wherein the fan is attached to the outer end in a state in which the rotor yoke is attached between the fan and the outer end , and wherein the cylindrical rotor yoke includes a connecting portion formed to overlap the outer end along the radial direction of the motor shaft , a tubular portion formed so as to arrange the magnets on the inner circumferential surface, and a joint portion configured to join the connecting portion and the tubular portion via a plurality of bending portions formed between the connecting portion and the tubular portion , and a blade portion of the fan is arranged in a space formed between the fan and the joint portion . a motor shaft configured to rotatably support the rotor ; and a rotor attachment member including a base end extended from an outer periphery of the motor shaft outward in a radial direction and an outer end formed from an outer periphery of the base end outward in the radial direction, wherein the outer end is formed at a position close to the inner circumferential surface of the rotor yoke , as compared with an outer peripheral surface of the motor shaft , the rotor is attached to the outer end , the base end is formed so that a thickness in an axial direction of the motor shaft gradually decreases from the outer periphery of the motor shaft to the outer end that is radially outside, a step is formed between the base end and the outer end along the axial direction of the motor shaft , the rotor is attached to the outer end in a state in which an opening of the rotor yoke is fitted in the step , the outer rotor type motor further comprising a fan formed concentrically with the rotor yoke , wherein the fan is attached to the outer end in a state in which the rotor yoke is attached between the fan and the outer end , and wherein the cylindrical rotor yoke includes a connecting portion formed to overlap the outer end along the radial direction of the motor shaft , a tubular portion formed so as to arrange the magnets on the inner circumferential surface, and a joint portion configured to join the connecting portion and the tubular portion via a plurality of bending portions formed between the connecting portion and the tubular portion , and a blade portion of the fan is arranged in a space formed between the fan and the joint portion . <EOS>