A stator for an electric motor, comprising: a plurality of stator cores each made from a magnet material; an insulator (6a, 6b) which covers the stator cores; and a plurality of insulated electric wires which are wound round the stator cores through the insulator (6a, 6b) so that a plurality of coils are formed round the stator cores and a plurality of transition wirings are formed for wiring the plurality of coils to each other, wherein the insulator (6a, 6b) includes a plurality of projections for retaining the plurality of transition wirings, wherein each of the projections is formed with a plurality of guide paths for individually disposing the plurality of transition wirings at intervals and in substantially parallel, wherein the plurality of guide paths are formed by parallel rows of projecting pieces on a surface of the projection, wherein lengths of the guide paths in a width direction of the projection are made to gradually increase towards the stator core, wherein a width of the projection increases towards the stator core, and wherein the projecting pieces are molded together with the projection by injecting a resin, characterized in that all projecting pieces are arranged in such a manner as to be spaced apart from one another in the direction which is parallel to the rows formed by the projecting pieces and such that the plurality of projecting pieces may be formed together with the projections by spaces defined between an upper mold and a lower mold which can be separated from each other in vertical opposite directions which are perpendicular to a direction in which the guide paths formed on the projection extend. a plurality of stator cores each made from a magnet material; an insulator (6a, 6b) which covers the stator cores; and a plurality of insulated electric wires which are wound round the stator cores through the insulator (6a, 6b) so that a plurality of coils are formed round the stator cores and a plurality of transition wirings are formed for wiring the plurality of coils to each other, wherein the insulator (6a, 6b) includes a plurality of projections for retaining the plurality of transition wirings, wherein each of the projections is formed with a plurality of guide paths for individually disposing the plurality of transition wirings at intervals and in substantially parallel, wherein the plurality of guide paths are formed by parallel rows of projecting pieces on a surface of the projection, wherein lengths of the guide paths in a width direction of the projection are made to gradually increase towards the stator core, wherein a width of the projection increases towards the stator core, and wherein the projecting pieces are molded together with the projection by injecting a resin, characterized in that all projecting pieces are arranged in such a manner as to be spaced apart from one another in the direction which is parallel to the rows formed by the projecting pieces and such that the plurality of projecting pieces may be formed together with the projections by spaces defined between an upper mold and a lower mold which can be separated from each other in vertical opposite directions which are perpendicular to a direction in which the guide paths formed on the projection extend.