Construction kit with a number of elongate carrier base elements and the corresponding connecting elements, with which the basic elements can be connected to one another, characterized in that the carrier base elements (10; 20) as a continuous longitudinal hollow profiles of substantially round cross section (15; 25) are formed that, in each of the four along - boundary sides (12; 22) of the basic elements a respective side walls of the undercut, in the longitudinal direction of the continuous longitudinal groove (14; 24) is provided, and that the connecting elements a first group (30; 31;), which are each provided with at least one in the longitudinal grooves (14; 24) of the basic elements (10; 20) have a connecting piece which can be inserted, and a second group (50), which are each provided with at least one into the interior of the substantially round hollow profiles have a connecting piece which can be inserted.
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