There is a structure element, in particular for radiation shielding constructions, having at least one floor plate and at least one wall section and/or at least one ceiling section. The structure element is characterized in that the at least one wall section and/or the at least one ceiling section comprise/comprises at least two shell elements made from metal, plastic and/or wood and a layer which lies in between and is made from radiation shielding materials. In addition, a construction, in particular a radiation shielding construction, is proposed having at least one floor plate and/or ceiling plate which delimits a storey and a structure element described above.