Abstract: Two panel members, preferably with different thickness, made of foamed, hardened plastic material, are connected together by means of cross members made of metal, whereby the connecting flanges of the cross members have small dimensions and are foamed into the panel members with a high resistance to be pulled out. Each panel member comprises, on the upper side, a plurality of plugs and, on the lower side, a plurality of corresponding recesses. Further, there is provided an upper sealing rib and a lower sealing groove. Thereby, a plurality of formwork components can be sealingly assembled to form a shuttering for the erection of a concrete wall. Dovetailed grooves at the inner surface of the panel members ensure a reliable adhesion of the concrete on the panel members. These grooves also serve to receive separating members to form a wall termination.