An object of the present invention is to provide an emulsifiable concentrate which comprises pyriproxyfen as an active ingredient and wherein the emulsifiable concentrate is excellent in emulsion stability under conditions of low-rate dilution not only in soft water but also in hard water. The present application provides for an emulsifiable concentrate excellent in emulsion stability which comprises pyriproxyfen, alkylarylsulfonic acid salt, polyoxyethylene styrylphenyl ether, polyoxyethylene castor oil, fatty acid C1-C6 alkyl ester and aromatic hydrocarbon in specified amounts.