To safely and costlessly treat a metallic surface to form a frictional surface, by forming an adhesive layer containing a metal-rusting component on one side surface of a sheet material made of paper, cloth, chemical paper, etc.

Hydrochloric acid and nitric acid is forced to penetrate an adhesive layer 12 formed on one side surface of a sheet material 11 made of chemical paper. These hydrochloric acid and nitric acid serve as metal-rusting components. When this metallic surface-rusting sheet is stuck on a metallic surface, the rusting component permeates into the metallic surface and breaks the mill scale. In this way, the metallic surface is rusted to form a frictional face. And this method does not generate dust and noise and this method is safe and remarkably labor-saving and also the treatment cost of the friction face can be greatly reduced.