An electric motor has stator with a core of magnetic material, a winding frame covering the core and windings wound around the winding frame. The core has an annular yoke and a plurality of teeth that extend radially outwardly from the yoke. The winding frame is an overmolded structure and has an insulation part that covers the core, a supporting part disposed inward of the insulation part and a plurality of ribs that connect the insulation part and the supporting part. A reinforcing ring is embedded in the supporting part. The strength of the reinforcing ring is higher than the strength of the winding frame. Thus material utilization is improved and the weight of the stator is reduced while ensuring the strength of the supporting part.