To make equal stress distribution and reduce weight, by constituting a plurality of panels constituting each span so that they may have attenuating thickness from the yoke to the tip.

An array 1 is made the one which includes a span consisting of, for example, four pieces of panels 3, 4, 5, and 6 extending from a yoke 2 to the tip and connecting one another. Then, the thickness of individual panels 3, 4, 5, and 6 is thinned than adjacent inner panels I, thus the solar panel array is constituted so as to have a tapered contour from the yoke 2 to the tip 11. For example, by the constitution of four panels, the thickness of the beginning of the panel 3 is made, for example, one inch, and each panel 4, 5, and 6 is decreased in stages a quarter inch at a time, and the thickness of the panel 4 is made three quarters an inch, and the thickness of the panel 5 is made half an inch, and the thickness of the panel 6 is made quarter an inch. According to this constitution, the weight of the array 1 can be reduced by about 20% with the stress distribution roughly constant.