Provided are an additive for lubricating oil, including a compound represented by the following general formula (1) as an essential component, and a lubricating oil composition blending same: where R1, R3, R5, and R7 each independently represent an alkyl group having 1 to 20 carbon atoms, R2, R4, R6, and R8 each independently represent a hydrogen atom or an alkyl group having 1 to 20 carbon atoms, A represents a hydrocarbon group having 2 to 20 carbon atoms, and n represents a number from 1 to 10.