A surface treating agent for reverse osmosis membrane polyamide

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PROBLEM TO BE SOLVED : To provide a surface treatment agent that can effectively suppress fouling on a polyamide reverse osmosis membrane for a long term, substantially does not contain an organic solvent and is excellent environmentally.SOLUTION : A surface treatment agent includes a copolymer obtained through polymerization of monomer compositions including monomer represented by formula (1) and cationic (meth)acrylic acid ester, and water, and can be used for a polyamide reverse osmosis membrane. In the formula (1), Ris H or CH, Rand Rare a C1-4 alkylene group independently, and R, Rand Rare a C1-4 alkyl group independently.