To easily manufacture a approximate spherical framed structural body and realize a smooth spherical approximation by continuously combining a plurality of beam materials having the same length in a quadrangular form so that the connecting point has a prescribed radius of curvature.

Four beam materials 10 of the same length having a prescribed length dimension are combined in a quadrangular frame form, for example, diamond form. When three frames of the quadrangularly combined beam materials 10 are continued radially, for example, a spherical surface is approximated by their connecting points A, B, D, C, D, E, F, and G. When the quadraugularly combined beam materials 10 are continuously in a quadrangularly form in the same manner to extend the approximate area, a spherical surface of a semi-spherical form having a curvature radius R or more is approximated. According to this, an approximate spherical framed structural body can be easily manufactured, and a smooth spherical approximation can be realized.