Abstract: An agent for imparting stain resistance to a top-coat paint film that has (a) from 3 to 10 mass % of a compound represented by Formula (1) or a partial hydrolysis condensate thereof, wherein Formula (1) is R1—(OCH2CH2)n—O—Si(OR2)3 wherein R1 is an alkyl group having 1 to 6 carbon atoms or a hydrogen atom, R2 is the same or different and is an alkyl group having 1 to 6 carbon atoms, and n is an integer value from 2 to 4, (b) from 0.01 to 1 mass % of a catalyst with which the aforementioned (a) component can be hydrolyzed, (c) 0.5 to 3 mass % of an alkylsulfosuccinic acid salt based surfactant, and (d) from 86 to 96.49 mass % of an alcohol based solvent which has not more than 3 carbon atoms. A method for imparting stain resistance to a top-coat paint film employing the disclosed agent is also provided.