A motor comprising a stator and a rotor rotary with respect to the stator, the stator comprising: a stator core comprising a back yoke and a plurality of teeth projected from the back yoke in a radial direction; an insulator (320, 330); an insulation film integrally formed with the stator core; wherein each tooth of the plurality of teeth comprises, a tooth body extended in a radial direction of an outer or inner circumferential surface of the stator core to have the coils wound there around; and a pole shoe extended from one end of the tooth body in both circumferential directions, having an external diameter surface of the pole shoe when the tooth body is extended in a radial direction of an outer circumferential surface of the stator core or an internal diameter surface of the pole shoe when the tooth body is extended in a radial direction of an inner circumferential surface of the stator core facing the rotor via a gap therebetween, wherein the external diameter surface or internal diameter surface comprises an end surface formed from both ends of the external diameter surface or internal diameter surface in a direction in which the rotor is rotated and where the gap with the rotor is getting larger, wherein the insulation film is formed on an entire surface of the tooth except for an area between the end surfaces of the external diameter surface or the internal diameter surface of the pole shoe. a stator core comprising a back yoke and a plurality of teeth projected from the back yoke in a radial direction; an insulator (320, 330); an insulation film integrally formed with the stator core; wherein each tooth of the plurality of teeth comprises, a tooth body extended in a radial direction of an outer or inner circumferential surface of the stator core to have the coils wound there around; and a pole shoe extended from one end of the tooth body in both circumferential directions, having an external diameter surface of the pole shoe when the tooth body is extended in a radial direction of an outer circumferential surface of the stator core or an internal diameter surface of the pole shoe when the tooth body is extended in a radial direction of an inner circumferential surface of the stator core facing the rotor via a gap therebetween, wherein the external diameter surface or internal diameter surface comprises an end surface formed from both ends of the external diameter surface or internal diameter surface in a direction in which the rotor is rotated and where the gap with the rotor is getting larger, a tooth body extended in a radial direction of an outer or inner circumferential surface of the stator core to have the coils wound there around; and a pole shoe extended from one end of the tooth body in both circumferential directions, having an external diameter surface of the pole shoe when the tooth body is extended in a radial direction of an outer circumferential surface of the stator core or an internal diameter surface of the pole shoe when the tooth body is extended in a radial direction of an inner circumferential surface of the stator core facing the rotor via a gap therebetween, wherein the external diameter surface or internal diameter surface comprises an end surface formed from both ends of the external diameter surface or internal diameter surface in a direction in which the rotor is rotated and where the gap with the rotor is getting larger, wherein the insulation film is formed on an entire surface of the tooth except for an area between the end surfaces of the external diameter surface or the internal diameter surface of the pole shoe.