PROBLEM TO BE SOLVED: To provide an efficacy-enhancing composition for an amino acid-based agrochemical that is excellent in biodegradability, aquatic organism toxicity (fish toxicity), and compatibility with amino acid-based agricultural chemicals, is stable, and can effectively enhance the efficacy of amino acid-based agricultural chemicals, particularly rain resistance.SOLUTION: The present invention is an efficacy-enhancing composition for an amino acid-based agrochemical, the efficacy-enhancing composition comprising a specific mass ratio of three specific quaternary ammonium salts that comprise an ester group.【課題】生分解性、水生生物毒性（魚毒性）に優れ、アミノ酸系農薬と相溶性に優れ、安定で、アミノ酸系農薬の効力、なかでも耐雨性を効果的に増強できるアミノ酸系農薬用効力増強剤を提供する。【解決手段】エステル基を有する３種の特定の第４級アンモニウム塩を、特定の質量比で含有するアミノ酸系農薬用効力増強剤組成物。【選択図】なし
