US Patent 10562415 Seat apparatus

A seat apparatus includes: a seat on which a passenger of a vehicle sits; an inputter which is operated by the passenger; a fixer which fixes a position of the seat until the inputter is operated by the passenger and allows the position of the seat to be movable in a longitudinal direction of the vehicle when the inputter is operated by the passenger; and a restrictor which restricts the movement of the seat when a predetermined condition related to a traveling state of the vehicle or an external environment of the vehicle is satisfied in comparison with a case in which the predetermined condition is not satisfied.