One of the purposes of the present invention is to provide a microcapsule-manufacturing process which can control the diameter of particles and which can yield microcapsules that can ensure excellent retention and release of a water-soluble core substance. The other of the purposes thereof is to provide microcapsules which can ensure excellent retention and release of a water-soluble core substance. This microcapsule -manufacturing process includes: a step for preparing an emulsion by dispersing an aqueous solution (a) which is obtained by dissolving both a polymer soluble in an aqueous solvent and a water-soluble core substance in an aqueous solvent in a nonpolar solution (b) which is obtained by dissolving an emulsifier or a dispersant in a nonpolar solvent and a step for removing the aqueous solvent from the emulsion by subjecting the emulsion to heating and/or pressure reduction at a temperature of 20 to 100°C and a pressure of 0.1 to 0.001MPa, and thus forming a core-shell structure wherein the water-soluble core substance is covered with a shell which contains the polymer soluble in an aqueous solvent. The weight ratio of the aqueous solution (a) to the nonpolar solution (b) is 1/10 to 1/1.Un des objectifs de cette invention est de pourvoir à un procédé de fabrication de microcapsules qui peut contrôler le diamètre des particules et donner des microcapsules aptes à garantir une excellente rétention et libération dune substance de cœur hydrosoluble. Lautre objectif de cette invention est de pourvoir à des microcapsules aptes à garantir une excellente rétention et libération dune substance de cœur hydrosoluble, le procédé de fabrication desdites microcapsules comprenant : une étape de préparation dune émulsion par dispersion dune solution aqueuse (a) qui est obtenue par dissolution à la fois dun polymère soluble dans un solvant aqueux et dune substance de cœur hydrosoluble dans un solvant aqueux dans une solution non polaire (b) qui est obtenue par dissolution d
