Vehicle body frame structure

摘要

A vehicle body frame structure includes a first frame member having a high strength and a second frame member having a strength lower than that of the first frame member. The first frame member and the second frame member are joined integrally in line with each other, and the second frame member has a locally reinforced region in a joined section by fixation of a support member for supporting a part. The structure further includes a joint stiffener fixed to the second frame member. The stiffener functions so that the strength of the joined section gradually decreases from the first frame member to the second frame member.