STEERING LOCK HOLDER

PROBLEM TO BE SOLVED: To provide a holder having an inner face shape of a joined part precisely corresponding to its outer face shape and not to cause an inner face crack for a lock holder to be joined by forced fitting to a polygonal joining part of a steering shaft. SOLUTION: A holder has a polygonal inner face shape corresponding to its outer face shape of a polygonal joining part, further, lock grooves 18 and recessed parts 19 for pressure joining are arranged to an outer face of each side wall 11-16 corresponding to each side of polygonal shape. In cold forging, centripetal force is given to each side of polygonal shape by pressing each side wall 11-16 corresponding to each side of polygonal shape from oudside, the inner face of each side wall 11-16 is pressure joined to an outer face of a polygonal inner punch having an outer face shape corresponding to an outer face shape of a joining part, the inner face is formed to a precise polygonal shape, further, the lock grooves 18 and the recessed parts 19 for pressure joining are formed to an outer face.