A stator for a motor, the stator comprising: a stator core; teeth coupled to the stator core; a rotor spaced apart from the stator core in a radial direction of the stator core; and insulators (531, 532), each of the insulators (531, 532) being coupled respectively to a tooth among the teeth and having a hollow shape configured to receive the tooth; wherein the tooth comprises: a body that extends in the radial direction of the stator core, and a pole shoe that extends from one end of the body, wherein an outer surface of the pole shoe is curved and defines a gap between the pole shoe and the rotor, wherein each of the insulators (531, 532) comprises: a coil-wound portion that surrounds an outer circumferential surface of the tooth and that is configured to seat a coil; and side walls that respectively extend from both sides of the coil-wound portion and that are spaced apart from each other in the radial direction, wherein the side walls and the coil-wound portion define a space configured to receive the coil, wherein each of the insulators (531, 532) comprises a pair of parts coupled to each other, and one of the side walls comprises a coupling portion that couples the pair of parts to each other, and wherein the pair of parts of each of the insulators (531, 532) are coupled to each other to thereby define the coil-wound portion, the side walls, and a tooth receiving space that accommodates the tooth therein, wherein the side walls of each of the insulators (531, 532) comprise: an inner side wall that faces the rotor and that is disposed between the rotor and the coil; and an outer side wall that faces the stator core and that is disposed between the coil and the stator core, and characterized in that the outer side wall has a first portion of which thickness is greater than a thickness of the inner side wall, and wherein the coupling portion is disposed within the first portion. a stator core; teeth coupled to the stator core; a rotor spaced apart from the stator core in a radial direction of the stator core; and insulators (531, 532), each of the insulators (531, 532) being coupled respectively to a tooth among the teeth and having a hollow shape configured to receive the tooth; wherein the tooth comprises: a body that extends in the radial direction of the stator core, and a pole shoe that extends from one end of the body, wherein an outer surface of the pole shoe is curved and defines a gap between the pole shoe and the rotor, a body that extends in the radial direction of the stator core, and a pole shoe that extends from one end of the body, wherein an outer surface of the pole shoe is curved and defines a gap between the pole shoe and the rotor, wherein each of the insulators (531, 532) comprises: a coil-wound portion that surrounds an outer circumferential surface of the tooth and that is configured to seat a coil; and side walls that respectively extend from both sides of the coil-wound portion and that are spaced apart from each other in the radial direction, wherein the side walls and the coil-wound portion define a space configured to receive the coil, wherein each of the insulators (531, 532) comprises a pair of parts coupled to each other, and one of the side walls comprises a coupling portion that couples the pair of parts to each other, and wherein the pair of parts of each of the insulators (531, 532) are coupled to each other to thereby define the coil-wound portion, the side walls, and a tooth receiving space that accommodates the tooth therein, a coil-wound portion that surrounds an outer circumferential surface of the tooth and that is configured to seat a coil; and side walls that respectively extend from both sides of the coil-wound portion and that are spaced apart from each other in the radial direction, wherein the side walls and the coil-wound portion define a space configured to receive the coil, wherein each of the insulators (531, 532) comprises a pair of parts coupled to each other, and one of the side walls comprises a coupling portion that couples the pair of parts to each other, and wherein the pair of parts of each of the insulators (531, 532) are coupled to each other to thereby define the coil-wound portion, the side walls, and a tooth receiving space that accommodates the tooth therein, wherein the side walls of each of the insulators (531, 532) comprise: an inner side wall that faces the rotor and that is disposed between the rotor and the coil; and an outer side wall that faces the stator core and that is disposed between the coil and the stator core, and characterized in that the outer side wall has a first portion of which thickness is greater than a thickness of the inner side wall, and wherein the coupling portion is disposed within the first portion. an inner side wall that faces the rotor and that is disposed between the rotor and the coil; and an outer side wall that faces the stator core and that is disposed between the coil and the stator core, and characterized in that the outer side wall has a first portion of which thickness is greater than a thickness of the inner side wall, and wherein the coupling portion is disposed within the first portion.