Provided is a surface-treated powder, where at least one compound of general formula (1) adheres to the surface of the powder. In formula (1), R2 is a monovalent aromatic hydrocarbon group having 6-12 carbon atoms, R4 is a monovalent non-aromatic hydrocarbon group having 1-30 carbon atoms, R1 and R0 are a group selected from aforementioned groups defined for R2 and R4, and R3 is a group of formula (2), R5 is a divalent hydrocarbon group having 2 to 8 carbon atoms and R6 is an alkyl group having 1 to 6 carbon atoms, a, b, c, and d are integers of from 0-3, 0-200, 1-150, and 0-50, respectively, provided that when a is 0, d and e are integers of from 1-50 and 0-2, respectively, and c/(b+c+d) is 0.25 or more.
