| 摘要 |
PROBLEM TO BE SOLVED: To improve the rigidity of a skeletal structure unit in an in-plane direction, to thereby implement a single-layer structure of the unit and achieve reduction in number of component parts, weight saving, cut in manufacturing cost, and improved appearance of the same. SOLUTION: The skeletal structure unit 21 is formed of four frames 7 which are arranged like a lattice, and four columnar hubs 8 which each are arranged at a corner portion and connects the adjacent two frames 7 together. Each hub 8 is inclined by an angle of±θ2 in a span direction, wherein the inclined angleθ2 represents 45 deg..
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