PURPOSE: To permit easier construction work and application to a large-scale steel tower by dividing the cross section of a hollow steel tower longitudinally, providing a bending process inwardly for both the sides of neighboring divided segments or contact segments and forming a cross section by jointing in one united body together with outer peripheral walls.

CONSTITUTION: Divided and processed steel plate components 1 are formed by dividing longitudinally the cross section of a steel tower at arbitrary intervals, and this steel plate is bent in the center direction of the tower body and neighboring contact pieces 1b are formed. In addition, reinforcing flanges 1c reinforcing the contact sides are provided depending on the strength required. And longitudinal reinforcing column members 3a also functioning as reinforcing members for the outer peripheral wall 1a are formed, and the outer peripheral walls 1a and the longitudinal reinforcing column members 3a are fixed and jointed with bolts or rivets 2 thereby constituting the whole cross section of the steel tower. In this way, part of strength is used against the external force acting to the steel tower, any decrease in strength due to a local bucking occurred by stress received by the outer peripheral wall 1a is restricted, and the application to a large-scale steel tower is made possible.