Patent ID: 7414344

Claim:
A commutator for a motor having a rotation shaft with a rotation axis, the commutator comprising: a commutator main body including a plurality of commutator pieces arranged along a circumference, the center of which is a rotation axis of the motor, and a main body insulator holding the commutator pieces, wherein the main body insulator has a cylindrical portion that extends along the rotation axis of the motor and is pressed-fitted to the rotation shaft; a short-circuit member arranged on an end portion of the commutator main body and including a short-circuit conductor, which short-circuits predetermined ones of the commutator pieces, and a short-circuit insulator, in which the short-circuit member is embedded; and a boss formed integrally with the short-circuit insulator so as to project from the end portion of the commutator main body, wherein the cylindrical portion of the main body insulator is interposed between the rotation shaft and the short-circuit conductor of the short circuit member.