Pretreatment method for electroless plating, and pretreatment solution for electroless plating

A pretreatment method for electroless plating for performing an electroless plating on a substrate, the pretreatment method at least comprises a cleaner process;

• a soft etching process;
• an acid treatment process;
• a catalyst imparting process;
• and a catalyst reducing process,
• wherein the cleaner process comprises cleaning the substrate with a cleaner solution having a first surfactant,
• wherein the soft etching process comprises etching the substrate, dissolving a metal disposed on at least a portion of the substrate, and removing the first surfactant with a first treatment solution that includes a first acid,
• wherein the acid treatment process comprises washing the substrate with a second treatment solution that includes a second acid,
• wherein the catalyst imparting process comprises imparting an ionic catalyst on the substrate,
• wherein the catalyst reducing process comprises reducing complex ions adsorbed on the substrate to metal, and
• wherein an anionic surfactant for ionizing a part of a hydrophilic group to an anion is added to the first treatment solution and the second treatment solution, and
• the ionic catalyst is reduced in the catalyst reducing process to increase an adsorption amount of the catalyst on the substrate.