This organosilicon compound which comprises a betaine structure represented by formula (1) enables the achievement of a coating composition that has excellent hydrophilicity and excellent water resistance of antifogging properties.




(In the formula, each of R1 and R2 independently represents an alkyl group having from 1 to 10 carbon atoms or an aryl group having from 6 to 10 carbon atoms; R3 represents a divalent organic group that contains an aromatic ring having from 6 to 14 carbon atoms; each of R4 and R5 independently represents an alkyl group having from 1 to 6 carbon atoms; X represents an alkylene group having from 1 to 10 carbon atoms; Y represents COO−, SO3− or PO4−; and n represents an integer from 1 to 3.)