An object of the invention is to provide a novel sugar-alcohol-modified organopolysiloxane compound which can have hydrophilicity effectively imparted thereto with a raw material incorporated even in a smaller amount, by using a precursor having a sugar alcohol residue, and which provides a nonionic surfactant usable in a wide range of applications. Another object is to provide processes for producing the compound. The invention relates to a sugar-alcohol-modified organopolysiloxane compound represented by formula (1) and processes for producing the compound. ##STR00001## (In the formula, R.sup.1 represents a hydrocarbon group having 1-8 carbon atoms; X is a group represented by formula (2); Y represents --R.sup.4O(AO)nR.sup.5 (wherein AO is an oxyalkylene group having 2-4 carbon atoms, R.sup.4 is a divalent hydrocarbon group having 3-5 carbon atoms, R.sup.5 is any of a hydrogen atom, a hydrocarbon group having 1-24 carbon atoms, and an acyl group having 2-24 carbon atoms, and n is 1-100); R.sup.2 is any of R.sup.1, X, and Y; and a is 0-700, b is 0-100, and c is 0-50; provided that when b is 0, at least one of the R.sup.2s is X.) ##STR00002## (In the formula, R.sup.3 is a divalent hydrocarbon group having 3-5 carbon atoms; and d is 1-2.)