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 (33, 36) 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 (33, 36) 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.