PURPOSE: To increase the degree of freedom of design, apply to deep location, minimize steel material consumption, reduce welding area, reduce cost, and facilitate construction work.

CONSTITUTION: A pair of flanges 3 on which male joints 2 are formed by bending one end of a steel plate inward are arranged in parallel with each other, and both flanges 3 are connected through a web 2 near the other end. Near the both ends of the web 2, an angle steel 6 is fixed to its outer surface by welding, etc., and continuous grooves as female joints 5 are formed between the outer surface of the web 2 and the inner surface of the angle steel 6 in longitudinal direction. Also the male joints 2 are fitted closely into the female joints 5 so as to connect steel members for continuous wall bodies 1 and form a continuous wall body.