The present invention relates to a stator for a motor having a stator core having an annular back yoke and teeth protruded annularly in a radial direction from the back yoke, a plurality of coils adapted to be wound on the teeth, and an insulator adapted to cover the stator core and the coils for insulation and having supporting ends formed sequentially to have different heights so as to support the plurality of coils thereon, thereby preventing the plurality of coils from being in contact with one another and locking projections formed at both sides or one side of the supporting ends so as to prevent the coils from escaping from the supporting ends, wherein each of the supporting ends has a stepped groove formed at a position spaced apart by a predetermined distance from the locking projections so as to allow the nozzle of the coil winding machine to be accessed thereto, and a total of the depth of the stepped groove and the height of each of the locking projections is larger than the radius of the nozzle.