Patent ID: 7356253

Claim:
A rotational driving apparatus which comprises a motor, a worm that is pressingly fitted to an output shaft of the motor, and a worm wheel that meshes with the worm, so as to output rotation of the motor from the worm wheel via the worm, wherein the rotational driving apparatus comprises: a support member that is placed with forming a gap with respect to a tip end of the worm, the support member comprising a through hole positioned on a same axis as the worm; a pressing member that is inserted into the through hole, and protrudes from a tip end of the through hole to butt against a tip end face of the worm; a plug member that is fitted into the through hole to close the through hole, and in which a degree of a fitting of the plug member into the through hole is adjustable; and an urging member that is interposed between the pressing member and the plug member to urge the pressing member toward the worm.