A washing machine comprising: a body; a tub disposed in the body; a drum rotatably disposed in the tub; and a motor including a stator coupled to a rear surface of the tub and a rotor rotatably disposed inside the stator, wherein the stator comprises: a stator core including a core body and a plurality of core teeth extending inward from an inner circumferential surface of the core body in a radial direction of the core body; a first insulator and a second insulator covering both ends (110a, 110b) of the core body and the core teeth; a coil wound around the core teeth; and a plurality of insulation films disposed between the first insulator and the second insulator to electrically insulate the stator core and the coil, wherein the first insulator comprises a first insulator body covering one end of the core body, and a plurality of first insulator teeth covering one end of each of the core teeth, wherein each of the insulation films is inserted between neighbouring ones of the first insulator teeth, and wherein the first insulator further comprises a first seating rib protruding outward from an outer surface of each of the first insulator teeth to allow a corresponding one of the insulation films to be seated, characterised in that the first insulator further comprises at least one separation prevention protrusion protruding from the first seating rib toward the second insulator to prevent the corresponding one of the insulation films from being separated from the first seating rib. a body; a tub disposed in the body; a drum rotatably disposed in the tub; and a motor including a stator coupled to a rear surface of the tub and a rotor rotatably disposed inside the stator, wherein the stator comprises: a stator core including a core body and a plurality of core teeth extending inward from an inner circumferential surface of the core body in a radial direction of the core body; a first insulator and a second insulator covering both ends (110a, 110b) of the core body and the core teeth; a coil wound around the core teeth; and a plurality of insulation films disposed between the first insulator and the second insulator to electrically insulate the stator core and the coil, wherein the first insulator comprises a first insulator body covering one end of the core body, and a plurality of first insulator teeth covering one end of each of the core teeth, wherein each of the insulation films is inserted between neighbouring ones of the first insulator teeth, and wherein the first insulator further comprises a first seating rib protruding outward from an outer surface of each of the first insulator teeth to allow a corresponding one of the insulation films to be seated, characterised in that the first insulator further comprises at least one separation prevention protrusion protruding from the first seating rib toward the second insulator to prevent the corresponding one of the insulation films from being separated from the first seating rib. a stator core including a core body and a plurality of core teeth extending inward from an inner circumferential surface of the core body in a radial direction of the core body; a first insulator and a second insulator covering both ends (110a, 110b) of the core body and the core teeth; a coil wound around the core teeth; and a plurality of insulation films disposed between the first insulator and the second insulator to electrically insulate the stator core and the coil, wherein the first insulator comprises a first insulator body covering one end of the core body, and a plurality of first insulator teeth covering one end of each of the core teeth, wherein each of the insulation films is inserted between neighbouring ones of the first insulator teeth, and wherein the first insulator further comprises a first seating rib protruding outward from an outer surface of each of the first insulator teeth to allow a corresponding one of the insulation films to be seated, characterised in that the first insulator further comprises at least one separation prevention protrusion protruding from the first seating rib toward the second insulator to prevent the corresponding one of the insulation films from being separated from the first seating rib.