Patent ID: 8393672

Claim:
A structural member comprising: an outer panel having a first wall part; and an inner panel having a second wall part, wherein the outer panel and the inner panel form a closed cross-sectional structure, and wherein a thickness of the first wall part is larger than a thickness of the second wall part, wherein a neutral axis of a bend, at which compressive stress and tensile stress match each other, is positioned over the first wall part, and wherein a distance hc from the neutral axis to the second wall part satisfies the following expression: ∫ - h c H - h c ⁢ h × σ × ⅆ A = 0 wherein, H represents a distance from the first wall part to the second wall part, h is a variable representing the distance from the neutral axis to the second wall part, σrepresents the material strength, and A represents area.