Composed element, more particularly a piece of furniture, wherein this composed element (1) comprises at least a rear wall, as well as a number of constructional parts (3) forming a whole in which the rear wall has to be provided, wherein the rear wall forms the rear side of the composed element (1) and consists of one or more rear wall parts (9-10), wherein the construction parts (3) comprise, on the one hand, exterior panels as well as, on the other hand, one or more intermediate pieces, more particular intermediate panels, such as one or more shelves and/or one or more partition walls, wherein it comprises at least one attachment piece (44) for one or more of the rear wall parts (9-10) which cooperates with an intermediate panel.