PURPOSE: To suppress the stuck quantity of a brazing filler metal stuck to a connected member to the minimum required and reduce the cost by forming recesses reaching the connection portion of a connection line on the connected member, and filling the molten brazing filler metal only into the recesses.

CONSTITUTION: Multiple connecting claw sections 12 extended along the axis at a uniform interval in parallel with each other are formed at the lower end section of a commutator 10. The connecting claw sections 12 are then formed into a hook shape, and the winding of an armature coil is connected to them. A recessed groove 14 is formed in parallel with the axis at the middle section in the width direction on the outer periphery face of each connecting claw section 12. When end edges 12B of the connecting claw sections 12 are brought into contact with a molten brazing filler metal R, the temperature of the connecting claw sections 12 is further increased, flux is activated, the surface lubricating function is increased, when the temperature of the grooves 14 reaches the brazing filler material melting temperature, the brazing filler metal R rises along the grooves 14 via the capillary phenomenon. The brazing filler metal R is filled in the grooves 14.