An object of the present invention is to provide a technique for producing a microcapsule containing a pesticidal compound in a fatty acid ester such as methyl O-acetylricinoleate, which delays the release timing of the pesticidal compound as compared to a conventional microcapsule. Provided is a method for producing a microcapsule, which comprises:(1) keeping a mixture of a pesticidal compound, a compound represented by formula (I):wherein X represents - CH2-CH2- or - CH=CH-, R1represents a C1-C4 alkyl group, and R2represents a C1-C4 alkyl group, and a polyisocyanate at 20 to 60℃ for 3 hours or more；(2) adding the mixture to water containing a polyol or a polyamine to prepare liquid droplets in the water； and(3) forming a film of polyurethane or polyurea around the droplets.本發明的目的係提供製造在脂肪酸酯(例如：O-乙醯蓖麻油酸甲酯)中含有殺菌性化合物之微膠囊的技術，該微膠囊相較於習知微膠囊可延遲釋出殺菌性化合物的時間。製造微膠囊的方法包括下列步驟：(1)將殺菌性化合物、式(I)所示之化合物(其中X表示-CH2-CH2-或-CH=CH-，R1表示C1至C4烷基，以及R2表示C1至C4烷基)以及聚異氰酸酯的混合物，在20至60℃保持3小時以上，(2)將混合物加入含有多元醇或多胺的水中，在水中形成液態微滴；以及(3)在微滴的周圍形成聚胺酯或聚脲的膜。
