To provide a structure for mounting solar-cell modules to a roof, which is capable of reducing a weight of the whole of a solar-cell system by simplifying a module structure and a mounting structure of the solar-cell module; capable of reducing a construction cost as a result of simplifying the mounting structure; and also capable of reducing its weight as a load to the roof.

A solar-cell module M is comprised of a base body 1 and a solar-cell main body 2 made with a solar-cell layer 21 formed on the surface of a plastic film substrate 20, thereby permitting to simplify the module structure and to reduce its weight. A groove 6 straddling a seam fastening structure 13 of the folded-plate roof is formed by notching. A fastening wall 3 of the base body 1 arranged in a direction perpendicular to a folded-plate roof member 10 is held and fixed with a plurality of fasteners 25 fastened to the seam fastening structure 13, and then the solar-cell module M is fixed directly to ridge 11 of the folded-plate roof member 10.

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