Metal plating method and the pretreatment agent

And to provide a method of metal plating a simple method such as the conventional plating can not resin. Silane coupling agent having an azole in a molecule, such as imidazole and γ-glycidoxypropyltrialkoxysilane liquid in which an organic acid salt and a noble metal compound is pre-mixed or reaction of the coupling agent is an equimolar reaction product of a silane in subjected to surface treatment object to be plated, a metal plating method, characterized in that the electroless plating.