A motor comprising: a rotating shaft; a rotor coupled to the rotating shaft; and a stator disposed outside the rotor, wherein the stator includes a stator core having a plurality of teeth and a coil wound around each tooth of the teeth, the coil is wound a plurality of turns around the tooth to be stacked as a plurality of layers, and only the coil of (a ∗ n+1) th turns among the plurality of turns forms a first layer closest to the tooth, wherein a is the number of total stacked layers of the coil, and n is zero or a positive integer, characterized in that the stator includes an insulator disposed on the tooth; the insulator includes a body portion surrounding the tooth; the body portion includes a first side surface portion and a second side surface portion, wherein an outer surface of the first side surface portion and an outer surface of the second side surface portion are regions around which the coil is wound, and wherein an inner surface of the first side surface portion and an inner surface of the second side surface portion are regions in contact with both side surfaces of the tooth, the body portion further including a connecting portion which connects an upper end portion of the first side surface portion and an upper end portion of the second side surface portion; and the connecting portion includes winding guides protruding from a surface of the connecting portion, wherein the body portion includes an inner side guide and an outer side guide; wherein the inner side guide extends upward from an inner side end of the body portion, and the outer side guide extends upward from an outer side end of the body portion, a vertical height from the surface of the connecting portion to an upper end of each winding guide is less than a vertical height of the inner side guide from the surface of the connecting portion and a vertical height of the outer side guide from the surface of the connecting portion, wherein the height from the surface of the connecting portion to the upper end of each winding guide is less than a ∗ D and greater than (a-1) ∗ D, wherein a is the number of total stacked layers of the coil, and D is a diameter of a cross section of the coil. a rotating shaft; a rotor coupled to the rotating shaft; and a stator disposed outside the rotor, wherein the stator includes a stator core having a plurality of teeth and a coil wound around each tooth of the teeth, the coil is wound a plurality of turns around the tooth to be stacked as a plurality of layers, and only the coil of (a ∗ n+1) th turns among the plurality of turns forms a first layer closest to the tooth, wherein a is the number of total stacked layers of the coil, and n is zero or a positive integer, characterized in that the stator includes an insulator disposed on the tooth; the insulator includes a body portion surrounding the tooth; the body portion includes a first side surface portion and a second side surface portion, wherein an outer surface of the first side surface portion and an outer surface of the second side surface portion are regions around which the coil is wound, and wherein an inner surface of the first side surface portion and an inner surface of the second side surface portion are regions in contact with both side surfaces of the tooth, the body portion further including a connecting portion which connects an upper end portion of the first side surface portion and an upper end portion of the second side surface portion; and the connecting portion includes winding guides protruding from a surface of the connecting portion, wherein the body portion includes an inner side guide and an outer side guide; wherein the inner side guide extends upward from an inner side end of the body portion, and the outer side guide extends upward from an outer side end of the body portion, a vertical height from the surface of the connecting portion to an upper end of each winding guide is less than a vertical height of the inner side guide from the surface of the connecting portion and a vertical height of the outer side guide from the surface of the connecting portion, wherein the height from the surface of the connecting portion to the upper end of each winding guide is less than a ∗ D and greater than (a-1) ∗ D, wherein a is the number of total stacked layers of the coil, and D is a diameter of a cross section of the coil.