METHOD FOR JOINING MUTUAL MEMBERS CONSTITUTING FRAME STRUCTURE MOUNTED ON AUTOMOBILE, AND FRAME STRUCTURE MOUNTED ON AUTOMOBILE

摘要

A side member (2) (example of second member) having a hollow shape is inserted into holes (1a) formed in a cross member (1) (example of first member) (member insertion step). The cross member (1) and the side member (2) are joined by caulking by expanding an insertion portion (A) of the side member (2) from the inside of the insertion portion (A) (caulked junction step). The insertion portion (A) of the side member (2) is a portion inserted into the cross member (1).