Seat apparatus for vehicles, has securing member and hook which maintains engagement of lower bracket which rotatably supports upper bracket coupled with seat main body

摘要

An upper bracket (21) coupled with the seat main body (10) is rotatably supported with a lower bracket (28) which can be secured. The engagement of the lower bracket is maintained with a securing member (30) and a hook (25). Except when the upper bracket is in a predetermined state with respect to the lower bracket, a hook contact portion (25c) is made to abut the upper bracket. The releasing operation of the hook is then controlled.