The present invention provides a microencapsulation method of a solid substance and the microencapsulated composition obtained from said method of: (i) preparing a dispersion phase comprising (a) a solution containing a substance which forms a middle layer and (b) a solid substance that is insoluble or difficult to dissolve in said solution, (ii) obtaining a solid substance which has a layer made of the substance which forms the middle layer by phase-separating the substance which forms the middle layer from the solution and (iii) reacting a monomer that is polymelizable by condensation in the presence of the solid substance that has a layer made of the substance which forms the middle layer. The above method can efficiently microencapsulate pharmaceutical active ingredients, pesticidal ingredients, aroma active ingredient and so on that are solid substances and affords an efficacious microencapsulated composition of solid substances.