To prevent or reduce a rolling sound by fixing and providing a sintering oilless bearing to a motor frame via an anti-vibration material being placed in a coaxial cylinder shape.

An anti-vibration material 13 is provided between a motor frame 10 and a sintering oilless bearing 5 and consists, for example, of rubber. The anti-vibration material 13 is arranged coaxially at a motor shaft 7 as in the sintering oilless bearing 5. In this case, when the motor shaft 7 starts rotating, vibration of a radial direction is generated due to magnetic and mechanical unbalance of a sealed rotor in the motor shaft 7. However, the vibration is promptly absorbed by the anti-vibration material 13, thus rapidly reducing a rolling sound. Furthermore, the same result is obtained not only at a bearing 5 of a load side but also at a bearing 6 of the side of a commutator 3.