Abstract: The connecting arrangement is applied to each of two panels to be joined and has a lateral upright comprising at least one hollow support which extends over the entire length of the upright. Each support defines a substantially cylindrical seat and a passage which extends to the outside, which are respectively capable of accommodating a cylindrical portion and a web of a shaped connecting member. The member can be removably slid in with the portions thereof in the seats of two hollow supports of two contiguous panels. The connecting member is made in one piece from plastics material and the web may be flat or curved at variable angles. This permits the arrangement of contiguous panels in a coplanar configuration, at 90.degree. to each other or at 120.degree. to each other. The connecting member may be fixed in place after it has been slid in by members blocking the ends of the sets.