Miniature motor and method for manufacturing the same

A method for manufacturing a miniature motor, which has a closed-bottomed cylindrical motor casing having a cylindrical bearing support portion projecting from a central portion of a bottom of said motor casing, a motor-casing-side bearing accommodated in said bearing support portion, a casing cover fitted to an open end portion of said motor casing, a casing-cover-side bearing accommodated in a central portion of said casing cover, and a rotor rotatably supported by means of said motor-casing-side bearing and said casing-cover-side bearing, comprising the steps of:

• preparing said motor casing having said motor-casing-side bearing accommodated in the bearing support portion of said motor casing;
• setting said motor casing in a casing rest;
• coaxially pressing a rotating polishing rod against an end face of said motor-casing-side bearing at at least a portion which abuts a washer provided on a shaft of said rotor, so as to concentrically polish said portion in a circumferential direction;
• and
• attaching said rotor in a completed state and said casing cover to said motor casing.