PROBLEM TO BE SOLVED: To provide a base agent for a hair cosmetic which is excellent in hairdressing properties, re-hairdressing properties, holding power, and detergency, and can be blended into either an emulsion type preparation or an aerosol preparation instead of a solid oil content.SOLUTION: A nonionic copolymer contains a constitutional unit derived from an ethylenically unsaturated monomer having an alkylene oxide chain represented by any one of formulas (1) to (4) at a side chain in an ester bond or an amide bond. The formula (1) is -CHCR[CO-A-(EO)-(PO)-(BO)-R]-, the formula (2) is -CHCR[CO-A-{-(EO)-(PO)-(BO)}-R]-, the formula (3) is -CH-CR[CO-A-(CHO)-R]-, and the formula (4) is -CH-CR[CO-A-R]-.SELECTED DRAWING: None
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