To provide a reactive silyl group-modified silylketene acetal excellent in stability to heat, a reactive silyl group-modified poly(meth)acrylic acid derivative having a silylketene acetal terminal, obtained by using the same as an initiator, and a manufacturing method therefor.SOLUTION: There is provided reactive silyl group-modified silylketene acetal represented by the following general formula (1). In the formula, Rto Rrepresent each independently a hydrogen atom, a monovalent hydrocarbon group with 1 to 10 carbon atoms, Rrepresents a bivalent hydrocarbon group with 2 to 10 carbon atoms, Rand Rrepresent each independently a monovalent hydrocarbon group with 1 to 10 carbon atoms, Rto Rrepresent each independently a monovalent hydrocarbon group with 1 to 10 carbon atoms, but at least one of Rto Ris a branched or cyclic monovalent hydrocarbon group and total of the carbon number of Rto Ris 6 or more, and n represents an integer of 0 to 2.SELECTED DRAWING: None
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