A surfactant composition for agricultural chemicals, containing fatty acid polyoxyalkylene alkyl ether expressed by the following general formula (I),R1CO(EO)m(PO)nOR2 (I)wherein the fatty acid polyoxyalkylene alkyl ether has a narrow ratio of 55% by mass or more, where the narrow ratio is expressed by the following formula (A):Narrow ratio=Σi=nMAX−2i=nMAX+2Yi (A).