Abstract: A copper etching solution contains an oxidizing agent and an amine compound. The oxidizing agent is one or more selected from the group consisting of a perchlorate, a chlorate, a chlorite, a hypochlorite, hydrogen peroxide, and a perborate, and the amine compound has one or more primary amino groups or secondary amino groups.

Abstract: The purpose of the present invention is to provide a pretreatment method for electroless plating and a pretreatment solution for electroless plating capable of increasing an adsorption amount of a catalyst. A pretreatment method for electroless plating for performing an electroless plating on a substrate, the pretreatment method at least comprises: a cleaner process S10; a soft etching process S20 and/or an acid treatment process S30; a catalyst imparting process S40; and a catalyst reducing process S50, wherein an anionic surfactant for ionizing a part of a hydrophilic group to an anion is added to a treatment solution used in the soft etching process S20 and/or the acid treatment process S30, an ionic catalyst is imparted on the substrate in the catalyst imparting process S40, and the ionic catalyst is reduced in the catalyst reducing process S50 to increase an adsorption amount of the catalyst on the substrate.