Abstract: Thermoplastic resin, especially in resin moldings whose main raw material is polyolefin-based resin, does not impair mechanical strength, water resistance, chemical resistance at the time of production, and does not require specific disposal means. Provided are a method for decomposing a resin molded body capable of decomposing a body and a degradable resin product. Decomposition treatment of a resin molded body that includes decomposing a resin molded body by applying a decomposition treatment liquid containing a plurality of fatty acid metal salts having different oxidation numbers by any method of coating, spraying, spraying or dipping a degradable resin product to which the decomposition treatment method is applied.

Abstract: Thermoplastic resin, especially in resin moldings whose main raw material is polyolefin-based resin, does not impair mechanical strength, water resistance, chemical resistance at the time of production, and does not require specific disposal means. Provided are a method for decomposing a resin molded body capable of decomposing a body and a degradable resin product. Decomposition treatment of a resin molded body that includes decomposing a resin molded body by applying a decomposition treatment liquid containing a plurality of fatty acid metal salts having different oxidation numbers by any method of coating, spraying, spraying or dipping a degradable resin product to which the decomposition treatment method is applied.