Vehicle seat with side pieces made of autoreactive framework structures

A vehicle seat with a backrest-side and/or a seat part-side base structure which comprises at least one movable sidepiece structure. At least the sidepiece structure of the base structure is made of at least one framework structure. The at least one sidepiece framework structure has flexurally elastic flanks and deflectable transverse braces which lie between the flanks and which are arranged on the flanks via elastic connecting element, whereby a force pulse that acts on the transverse braces of the at least one sidepiece framework structure from one direction via a flexurally elastic flank causes a compensating autoreactive deformation of the at least one sidepiece framework structure in the opposite direction at another point.