Motor

A motor comprising:

• a motor body having a rotary shaft;
• a speed reduction mechanism, which includes a worm shaft and a worm wheel meshed with the worm shaft;
• and
• a coupling portion, which has a coupling hole and couples the rotary shaft and the worm shaft with each other so that the rotary shaft the worm shaft are integrally rotational, wherein
• the coupling portion is provided to be rotational integrally with one of the rotary shaft and the worm shaft,
• a coupling projection is provided on the other one of the rotary shaft and the worm shaft, the coupling projection being inserted in the coupling hole,
• a circumferential clearance, which is a clearance in a circumferential direction, and a radial clearance, which is a clearance in a radial direction, are formed between an inner surface of the coupling hole and the coupling projection,
• a circumferential buffer portion is located in the circumferential clearance,
• a radial buffer portion is located in the radial clearance, and
• the inner surface of the coupling hole and the coupling projection are configured to be contactable with each other in the circumferential direction while compressing and deforming the circumferential buffer portion in the circumferential direction when the motor body is driven to rotate the rotary shaft.