An organopolysiloxane represented by the following general formula (A), (B) or (C) SinR12n+2On−1  (A) SinR12nOn  (B) SinR12n+2R2kOn−k  (C) wherein R1 may be the same with or different from each other and is a hydrogen atom or a monovalent organic group, R2 is an alkylene group having 2 to 6 carbon atoms, n is an integer of from 2 to 40 and k is an integer of 1 to 3, characterized in that at least two R1's are represented by the following formula (i): wherein X is a hydrolyzable group, R3 is an alkyl group having 1 to 4 carbon atoms or a phenyl group, y is an integer of from 1 to 5 and a is 2 or 3; and one SiR1 bond is represented by the following formula (ii) or one SiOSi bond is replaced with a bond represented by the following formula (iii): SiQRf1  (ii) SiQRf2QSi  (iii) wherein Rf1 is a monovalent group containing a perfluoroether residue, Rf is a divalent group containing a perfluoroether residue, and Q is a divalent organic group.