Abstract: This object is achieved by a rope tightening device for space defining nettings of a three-dimensional framework wherein rope parts of the space defining nettings are connected to the junction point members of a supporting frame to which frame the space defining netting is attached, the rope tightening device according to the present invention being characterized in that a rope receiving part (6, 6a) is arranged, by means of a tightening screw (10), on an inner surface or an outer surface of a hollow junction point member (1) or on an outer surface of a solid junction point member, respectively, wherein said rope receiving part (6, 6a) is movable in the direction of the tightening motion, and that the rope parts (3) of the space defining netting which is to be tightened are fixable within the rope receiving part (6, 6a).