Abstract: A foldable furniture unit employing scissors-acting seat frames and upright side frames has restraining members on the seat rail portions of the seat frames adapted to be positioned adjacent portions of the side frames to reduce relative movement between the seat rails and the side frames and thereby stabilize the unit when it is in unfolded condition for use. The restraining members preferably are provided by cap-like members which are also capable of at least partially closing welt and core receiving slots in the seat rails by which a flexible seat web is secured to the seat rails.