To increase the number of windings by increasing the thickness of a coil by the thickness of a printed wiring board irrespective of thin thickness, and to obtain a long lifetime by increasing the thickness of a sliding portion of a rectifier.

An axial air-gap type rotor consists of a plurality of winding type air-core armatures 3 provided so as not to overlap the printed wiring board having a shaft supporting portion on its center; and a planar commutator C consisting of a plurality of commutator pieces 5 provided with sliding portions separated from each other on a base portion formed of a resin 4 for integrating the winding type air-core armature coil and a terminal portion formed integrally from the sliding portion and connected to the printed wiring board. In the rotor, the printed wiring board is provided with terminal wire connecting land of the winding type air-core armature coil, a plurality of through-holes 2a connected to the terminal connecting land and a terminal connecting land connected to the through-holes, wherein the commutator pieces are connected to the terminal connecting land.