To provide a space truss structural surface plate assembly having volume efficiency, reducing the cost and having high performance and high bearing force.
An apex rhombus is defined in a state of being positioned at an upper part of a central point of a square defined by connecting four bottom point rhombuses on the same plane, and a group composed of pyramidal bodies substantially having the same height, and having four planar inclined planes, is formed by connecting each of the bottom point rhombus and the apex rhombus. Two pyramidal surface plates respectively formed by arranging pyramidal bodies around one pyramidal body, in adjacent to each other in a state of sharing one bottom rhombus and in parallel with each other in a reticular pattern of equal pitches in the specific direction, are used. The two pyramidal surface plates are overlapped and assembled in a state that the pyramidal bodies arranged in a reticular pattern are shifted from each other by half-pitch in the specific direction, the apex rhombus of one of the pyramidal bodies is kept into contact with the bottom point rhombus of the other pyramidal body, and the apex rhombus of the other pyramidal body is kept into contact with the bottom point rhombus of one of the pyramidal bodies.
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