Patent attributes
A seat adjuster in one aspect of the present disclosure comprises a rotating part, a rotational drive, an engagement target member, an engagement member, and a controller. The controller executes a lock transition process in a case where a seatback is pivotally moved to a specified front-tilt position, which is further to a forward direction than an upright position is, while the engagement member is in an unlocked state where the engagement member is not engaged with any one of engagement target portions of the engagement target member. The lock transition process is a process where the controller rotates the rotating part via the rotational drive such that one of the engagement target portions is placed at an engageable position, and engages the engagement member with the one of the engagement target portions.