The present invention is a structural member which is formed in a length direction form the primary frame; And, arranged on the connection portion of the structural member, the junction node structure for connecting the structural member, the structural member comprises, and the is disposed longitudinally between the junction node structure, which is spaced apart form the height direction a plurality of steel tube frame; And, formed spaced apart in the height direction, the connection between the steel tube frame, web members formed of a relative to the steel tube frame relative to cross section reduction forms; the junction node structure, and a is arranged on the contact of the steel pipe frame a plurality of junction nodes are arranged, spaced apart in the height direction; Spaced in the height direction connected to the steel connecting between the junction node; One pairs of installation, which is installed integrally to the ends of at least two steel tube frame which is provided with, and spaced in the height direction; and, are arranged radially to each of the junction node connecting the flange to provide a connection portion of the steel pipe frame and the flange is formed, there is provided a frame structure, characterized in that the fastening bolt in a pair of the at least two or more of said connecting flange in the insertion space portions formed between the mounting flange inserted.