To solve the problem of a current roof material such as a tile made of natural stone and clay and a roof material made of cement that they are heavy and the weight thereof is applied to a rafter, a sheathing and a roof main body and that a large load is applied to the whole of a building and that even a light roof material includes some toxic substance giving a bad influence to the natural environment.

This thin plates laminated roof material obtained by providing a curvature to form a wave-like continuous projecting and recessed parts in a plate body formed by laminating several wood thin plates, or by fixing a strip material formed by laminating thin plates in a surface of the plate body or a surface and a back surface of the plate body formed by laminating several wood thin plates, and performing the disaster preventing work to the surface thereof is used to provide the light roof material reduced in a load to be applied to the building as much as possible and good for the natural environment.