The present invention is a filming agent composition for an agricultural chemical which includes (A) 5 30 wt% of polysaccharide (B) 5 40 wt% of polyoxyalkylene sorbitan fatty acid ester and (C) 5 40 wt% of one or more nonionic surfactants selected from polyoxyalkylene alkyl ether sorbitan fatty acid ester and a silicone surfactant wherein the viscosity of a 5 wt% aqueous solution of (A) at 25�C is 5 000 mPa�s or more and the (A)/[(B)+(C)] weight ratio is 10/90 40/60.
