To provide a method for forming a multiple layer coating film in which the corrosion reaction of a silver plated layer is suppressed to maintain the silver plated layer for a long period.

In the method for forming the multilayer coating film obtained by successively forming a base coating film, the silver plated layer and a clear coating film layer on a base board, after being formed, the silver plated layer is treated with a chlorine-containing compound aqueous solution to form a silver chloride film.