Motor having rotatable shaft coupled with worm shaft

A motor comprising:

• a motor main body, which includes a rotatable shaft and rotates the rotatable shaft;
• a speed reducing unit, which is connected to the motor main body and includes a worm shaft, wherein the worm shaft is substantially coaxial with the rotatable shaft;
• and
• a coupling means for coupling the rotatable shaft with the worm shaft, wherein the coupling means includes:
• a driving-side rotator, which is connected with the rotatable shaft to rotate integrally with the rotatable shaft;
• and
• a driven-side rotator, which is connected with the worm shaft to rotate integrally with the worm shaft and is engageable with the driving-side rotator in a rotational direction, wherein:
• the rotatable shaft includes a connecting portion;
• and
• the driving-side rotator includes a connecting portion, which is loosely fitted with the connecting portion of the rotatable shaft and is engageable with the connecting portion of the rotatable shaft in the rotational direction to rotate integrally with the connecting portion of the rotatable shaft.