To obtain a laminate having stable and excellent qualities without causing air pollution and with saving resource at a low cost.

A thermosetting resin and a powdery curing agent are used as essential components. A mixture of the components is provided with mechanical energy to cause a mechanochemical reaction. Then the resultant material is ground, dispersed and mixed by a medium stirring type mill to give a powdery resin composition, which is preferably uniformly mixed with a fine powder additive having 0.01-1 μm average particle diameter to give a powdery resin composition, which is made to exist at least on the surface of a sheetlike fiber base to give a prepreg. One prepreg or plural prepregs are laminated and heated under pressure to produce the laminate.