Provided are a catalyst application bath for electroless plating, a method of producing a catalytic nucleus-containing material to be electroless plated using the catalyst application bath for electroless plating, a method of producing a material with an electroless plating deposit, and a material with an electroless plating deposit, each of which may provide good patternability even without a post-dip step which can cause non-deposition in electroless plating, and thus may achieve both patternability and electroless plating deposition. Included is a catalyst application bath for electroless plating, containing a palladium compound and an aminocarboxylic acid.