In a rudder for ships composed of a rudder blade with a rudder post (40) held and supported in a rudder trunk (20), the rudder trunk (20) is made of a fiber composite material and is inserted into a nautical outer trunk tube (90) made of steel or of another appropriate material prepared by a shipyard, extending into the lower edge of the head box and inserted into the rudder blade (30). After alignment of the rudder trunk (20) in the nautical trunk tube (90), the intermediate space between both components (20, 90) is cast with a cast resin, or both components (20, 90) are bonded together.