PROBLEM TO BE SOLVED: To provide an organosiloxane derivative composition allowing oil solution to stably gelate with a small amount of the organosiloxane derivative composition.SOLUTION: The organosiloxane derivative composition has a functional group represented by average general formula (1): -(CH2)2-A-COO-(Mn+)s(OH-)t (1) (In the formula, A is a straight or branched chain alkylene group represented by CqH2q, where q is an integer 0 to 20. M is one or more kinds of n-valent metal cations and n is a number of 2 or more. s is a number of 0.1