An organopolysiloxane compound represented by average structural formula (1) is capable of imparting an electron beam curable resin with high antistatic properties, while having excellent antistatic performance durability.




(In the formula, Z represents a single bond or a group having a functionality of 2-20 and containing an organopolysiloxane structure; R1 represents a single bond, or an unsubstituted or substituted alkylene group having 1-20 carbon atoms; each of R2 and R3 represents an unsubstituted or substituted alkyl group having 1-10 carbon atoms, or the like; Y represents a monovalent hydrocarbon group having a polymerizable reactive group; each of p and q represents a number of 1-10, with (p+q) being 2-20 in accordance with the valence of Z; and in cases where Z represents a single bond, p and q represent 1, A− represents an anion and Q+ represents a cationic group that is represented by one of formulae (2)-(4)





(wherein each one of R4-R10 represents an alkyl group having 1-20 carbon atoms, or the like; each one of R11-R13 represents a hydrogen atom or the like; and * represents a bonding hand).)