a structural wing - fuselage component for connecting two aerofoils to a fuselage section of an aircraft includes : a first wing shell component for the first wing and a second wing shell component for the second wing , with each component being made in a single piece and comprising a shell component on the wing side and a shell component on the fuselage side , where each shell component on the fuselage side comprises coupling parts and recesses in each case situated between the coupling parts , where in the installed state the coupling parts and the recesses of the shell component on the fuselage side for the first wing and of the shell component on the fuselage side for the second wing interlock , and where at least two coupling parts at their ends pointing away from the shell component on the wing side each comprises an extension part , a partially cylindrical fuselage shell component whose supporting rims include recesses which are engaged by the extension parts of the first wing shell components .