Abstract:
The high proof bending stress structure member of the present invention includes a thin wall frame structure member, a solidified granular material comprising a first granular material each of which is charged closely inside the thin wall frame structure member, such that one of the first granular material is in contact with another first granular material adjacent thereto, and a thermoplastic resin foam which fills the gap between each of the first granular material and which is welded to the surface of the first granular material whereby connecting the first granular material to each other, and the inner wall of the thin wall frame structure member with the first granular material.