Structural member

A structural member which is provided with a plurality of high-strength steel pipes, and which is characterized in that each high-strength steel pipe has a quenched section in the center of the pipe and a non-quenched section extending at least over the entire circumference of one pipe end, the area ratio of the martensitic structure in the quenched section being 90% or more, and the area ratio of the ferritic structure in the non-quenched section being 30-100%, the area ratio of a pearlite structure is 0-70%, the total area ratio of a martensitic structure and a bainite structure is 0-10%, and the non-quenched part has a welded part welded to another member. 一种结构构件，其具备多个高强度钢管，其特征在于，上述高强度钢管具有管中央部的淬火部、和至少遍及一个管端部的整周的非淬火部，上述淬火部的马氏体组织的面积率为90％以上，上述非淬火部的铁素体组织的面积率为30％以上且100％以下，珠光体组织的面积率为0％以上且70％以下，马氏体组织及贝氏体组织的合计面积率为0％以上且10％以下，上述非淬火部具有与其它构件焊接在一起的焊接部。