To provide a hollow structure shaped material in which the hollow structure shaped materials 40 each other can be joined by moving a friction stir joining tool 30 only from one side of the hollow structure shaped material 40, and moreover, which is suitable for joining by using a rotary tool 30 for bobbin type friction stir joining, and a method for manufacturing a structure using it.

The hollow structure shaped material 40 is composed of two opposing plates 40a, 40b and a plurality of rib plates 40c which connect and support both plates. The tip of the two opposing plates 40a, 40b is extended further compared with the connection part with the rib plate 40c at the very end. And, the tip of one plate 40a of the two opposing plates 40a, 40b is shortened compared with that of the other plate 40b. The structure can be manufactured by performing the friction stir joining to the other plates 40b between each other of the two hollow structure shaped materials 40, and next, to a joint plate 41 and one plate 40a by using the bobbin tool 30.