| 摘要 |
A seat adjusting apparatus for a vehicle includes a supporting member pivotally supported at a base member by means of a first bearing, a pinion gear driven by a driving device, a sector gear engageable with the pinion gear and a restriction mechanism formed at the sector gear for restricting a relative rotation between the pinion gear and the sector gear. The restriction mechanism includes a contact portion coming in contact with the pinion gear so that a component force of a reaction force, which works in a direction in which the first bearing is separated from the second bearing, acting on the pinion gear is reduced. A thickness of a first tooth root of a tooth included in the teeth formed at the sector gear is larger than a thickness of a second tooth root of the other teeth formed at the sector gear.
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