To provide a polysiloxane having a phosphorylcholine analog group, capable of suppressing pH restriction in use as a surface modifier, to provide a method of producing the polysiloxane, to provide a surface modifier containing the polysiloxane, and to provide a surface modification method using the surface modifier.

The polysiloxane has a constituent unit formed by binding a functional group represented by the general formula (wherein, R1, R2and R3independently represent a 1-6C alkyl group; and m represents an integer of 2-6), an ester or amide bond, a spacer, and a silicon atom sequentially.

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