To provide a polyalkylene glycol-based copolymer useful in applications demanding high detergency such as a detergent builder, responding to various soils such as hydrophilic or hydrophobic soils in such applications, excellent in characteristics such as anti-soil redeposition capability, and which can be used in various applications in which polyalkylene glycol copolymers are used, a monomer useful as a raw material of such a copolymer, a production method thereof, and the use thereof.

This polyalkylene glycol-based copolymer comprises a constitutional unit (a) derived from a polyalkylene glycol chain-containing unsaturated monomer (A) and a constitutional unit (b) derived from an unsaturated carboxylic acid-based monomer (B), wherein the polyalkylene glycol chain-containing unsaturated monomer (A) contains at least three polyalkylene glycol chains and has, between an unsaturated bond and a nitrogen atom, at least one polyalkylene glycol chain-branching structure.

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