A method for producing a rudder blade segment, namely a rear rudder blade section comprising a trailing edge, or a rear section of a rudder fin, comprising the steps of: - providing a first panel plate, - arranging a first number of reinforcing bodies (18, 18a, 18b) on the first panel plate, - fastening the first number of reinforcing bodies (18, 18a, 18b) to the first panel plate to produce a first panel, - arranging frame elements (28, 28a, 28b) on the first panel plate, wherein the frame elements (28, 28a, 28b) are aligned orthogonally to the reinforcing bodies (18, 18a, 18b) of the first number of reinforcing bodies (18, 18a, 18b), - providing a second panel plate, - arranging a second number of reinforcing bodies (18, 18a, 18b) on the second panel plate, - fastening the second number of reinforcing bodies (18, 18a, 18b) on the second panel plate to produce a second panel, - arranging frame elements (28, 28a, 28b) on the second panel plate, wherein the frame elements (28, 28a, 28b) are aligned orthogonally to the reinforcing bodies (18, 18a, 18b) of the second number of reinforcing bodies (18, 18a, 18b), - arranging the first panel and the second panel in such a way that the first panel plate and the second panel plate form an outer wall of the rudder blade segment to be produced and that the first number of reinforcing bodies (18, 18a, 18b) and the second number of reinforcing bodies (18, 18a, 18b) are directed into an interior of the rudder blade segment to be produced, - connecting the first panel and the second panel, wherein the frame elements (28, 28a, 28b) of the first panel are jointed with the frame elements (28, 28a, 28b) of the second panel to form a frame of the rudder blade segment and are connected by welding along a weld seam running centrically in a centre plane of the rudder blade segment to be produced. - providing a first panel plate, - arranging a first number of reinforcing bodies (18, 18a, 18b) on the first panel plate, - fastening the first number of reinforcing bodies (18, 18a, 18b) to the first panel plate to produce a first panel, - arranging frame elements (28, 28a, 28b) on the first panel plate, wherein the frame elements (28, 28a, 28b) are aligned orthogonally to the reinforcing bodies (18, 18a, 18b) of the first number of reinforcing bodies (18, 18a, 18b), - providing a second panel plate, - arranging a second number of reinforcing bodies (18, 18a, 18b) on the second panel plate, - fastening the second number of reinforcing bodies (18, 18a, 18b) on the second panel plate to produce a second panel, - arranging frame elements (28, 28a, 28b) on the second panel plate, wherein the frame elements (28, 28a, 28b) are aligned orthogonally to the reinforcing bodies (18, 18a, 18b) of the second number of reinforcing bodies (18, 18a, 18b), - arranging the first panel and the second panel in such a way that the first panel plate and the second panel plate form an outer wall of the rudder blade segment to be produced and that the first number of reinforcing bodies (18, 18a, 18b) and the second number of reinforcing bodies (18, 18a, 18b) are directed into an interior of the rudder blade segment to be produced, - connecting the first panel and the second panel, wherein the frame elements (28, 28a, 28b) of the first panel are jointed with the frame elements (28, 28a, 28b) of the second panel to form a frame of the rudder blade segment and are connected by welding along a weld seam running centrically in a centre plane of the rudder blade segment to be produced.