A center backrest assembly having a main body which is mounted in the vehicle interior so as to be pivotable between an upright backrest position and a lowered functional position. The main body includes a head region which in the backrest position is positioned at the top. The head region on at least one lateral face has a lateral part which is mounted on the main body so as to be movable between a bearing position which bears on the head region and a laterally deployed deployment position.