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PROBLEM TO BE SOLVED : To provide a method capable of improving melt fluidity of a thermoplastic resin.SOLUTION : A structural unit represented by formula (1a) and/or (1b) is introduced into a thermoplastic resin to improve melt fluidity of the thermoplastic resin. (In the formula, Rand Rare the same or different and each represent an optionally substituted alkylene group; Rrepresents an inert substituent; m represents an integer of 0-4; and k represents 0 or an integer of 1-4.)