Abstract: A wall system for exhibition halls has a plurality of rigid wall elements each having two cover plates, profiles arranged between the cover plates on vertical edges for receiving of coupling elements, the profiles having a longitudinal groove with inwardly conical reducing cross-section, the longitudinal groove having side walls provided with oppositely located longitudinal grooves, the profile being provided with at least one opening arranged at one side selected from the group consisting of an upper end side and a lower end side for receiving a pin or a screw of mounting elements arranged on an edge of the wall element selected from the group consisting of an upper edge and a lower edge.