The number of pins necessary to route crossover lines is reduced while armature coils in each phase are connected in series. An armature coil (Lua) includes a first portion (Lu1), a second winding portion (Lu2), a first winding end (Luas), a second winding end (Luae), and a crossover portion (Luab), and is continuously wound. The first winding portion is concentratedly wound in a counterclockwise winding direction (Ru1) with respect to a direction (Du1) obtained in viewing a second end portion (Tu1o) from a first end portion (Tu1i) of a tooth (Tu1), as it passes from the first winding end to the crossover portion. The second winding portion is concentratedly wound in a clockwise winding direction (Ru2) with respect to a direction (Du2) obtained in viewing a second end portion (Tu2o) from a first end portion (Tu2i) of the tooth, as it passes from the crossover portion to the second winding end.