An armature winding of multiple phases has a phase winding that is made of a plurality of partial windings for each phase. The partial winding includes a pair of intermediate conductor portions and crossover portions that connect the pair of intermediate conductor portions in an annular shape, and is configured by a conductor material being wound in multiple layers in the pair of intermediate conductor portions and the crossover portions. The intermediate conductor portions of the phases are arrayed in a predetermined order in the circumferential direction by one of the intermediate conductor portions of the pair of intermediate conductor portions of the partial winding of another phase being arranged between the pair of intermediate conductor portions of the partial winding. A sheet-shaped insulation covering body is provided in the intermediate conductor portion in a portion that opposes the intermediate conductor portion of the partial winding of another phase.