A method for improving the pesticidal effects of an anthranilamide compound or its salt as an active ingredient, by means of a polyoxyalkylene phosphoric acid ester surfactant; wherein the blend ratio of the anthranilamide compound or its salt to the polyoxyalkylene phosphoric acid ester surfactant is from 10:1 to 1:1000 by weight ratio, wherein the polyoxyalkylene phosphoric acid ester surfactant is one represented by the following formula, or: wherein each of R and R b which are independent of each other, is alkyl or phenyl which may be substituted by alkyl, each of R a, Z, Z 1 and Z 2 which are independent of one another, is alkylene, M + is a hydrogen ion, a metal ion, ammonium or organic ammonium, each of n, s and t which are independent of one another, is an integer of at least 1, x and y satisfy x+y=3, and x is an integer of 1, 2 or 3, and y is an integer of 0, 1 or 2; wherein, when x is at least 2, a plurality of R, R a, R b, Z, Z 1, Z 2 or n contained in [RO n], [R b n R a O] or [R b (Z 1 O) s R a O(Z 2 O) t] may be the same or different from one another, when y is 2, the two M + may be the same or different from each other, and in the formula, Z 1 and Z 2 may be the same or different from each other, and wherein the anthranilamide compound is 3-bromo-N-(2-bromo-4-chloro-6-(1-cyclopropylethylcarbamoyl)phenyl)-1-(3-chloropyridin-2-yl)-1H-pyrazol-5-carboxamide, 3-bromo-N-(4-chloro-2-(1-cyclopropylethylcarbamoyl)-6-methylphenyl)-1-(3-chloropyridin-2-yl)-1H-pyrazol-5-carboxamide, 3-bromo-N-(2-bromo-4-chloro-6-(cyclopropylmethylcarbamoyl)phenyl)-1-(3-chloropyridin-2-yl)-1H-pyrazol-5-carboxamide, 3-bromo-N-(4-chloro-2-methyl-6-(methylcarbamoyl)phenyl)-1-(3-chloropyridin-2-yl)-1H-pyrazol-5-carboxamide or 3-bromo-1-(3-chloropyridin-2-yl)-N-(4-cyano-2-methyl-6-(methylcarbamoyl)phenyl)-1H-pyrazol-5-carboxamide. each of R and R b which are independent of each other, is alkyl or phenyl which may be substituted by alkyl, each of R a, Z, Z 1 and Z 2 which are independent of one another, is alkylene, M + is a hydrogen ion, a metal ion, ammonium or organic ammonium, each of n, s and t which are independent of one another, is an integer of at least 1, x and y satisfy x+y=3, and x is an integer of 1, 2 or 3, and y is an integer of 0, 1 or 2; wherein, when x is at least 2, a plurality of R, R a, R b, Z, Z 1, Z 2 or n contained in [RO n], [R b n R a O] or [R b (Z 1 O) s R a O(Z 2 O) t] may be the same or different from one another, when y is 2, the two M + may be the same or different from each other, and in the formula, Z 1 and Z 2 may be the same or different from each other, and wherein the anthranilamide compound is 3-bromo-N-(2-bromo-4-chloro-6-(1-cyclopropylethylcarbamoyl)phenyl)-1-(3-chloropyridin-2-yl)-1H-pyrazol-5-carboxamide, 3-bromo-N-(4-chloro-2-(1-cyclopropylethylcarbamoyl)-6-methylphenyl)-1-(3-chloropyridin-2-yl)-1H-pyrazol-5-carboxamide, 3-bromo-N-(2-bromo-4-chloro-6-(cyclopropylmethylcarbamoyl)phenyl)-1-(3-chloropyridin-2-yl)-1H-pyrazol-5-carboxamide, 3-bromo-N-(4-chloro-2-methyl-6-(methylcarbamoyl)phenyl)-1-(3-chloropyridin-2-yl)-1H-pyrazol-5-carboxamide or 3-bromo-1-(3-chloropyridin-2-yl)-N-(4-cyano-2-methyl-6-(methylcarbamoyl)phenyl)-1H-pyrazol-5-carboxamide.