The present invention provides a microcapsule containing a biodegradable polymer and risperidone and having a sustained release property as well as a method of producing the same. Provided are a microcapsule containing a biodegradable polymer and risperidone, in which the biodegradable polymer contained in the microcapsule has a molecular weight corresponding to 85% or more of an initial molecular weight (Mw) of the biodegradable polymer a method of producing a microcapsule, comprising (A) a step of preparing a first phase by mixing a solution of a biodegradable polymer and a solution of risperidone which are prepared separately, (B) a step of, immediately after the preparation of the first phase, mixing the first phase with a second phase being an aqueous phase to prepare an emulsion, and (C) a step of subjecting the resulting emulsion to in-water drying and a method of controlling release of risperidone from a microcapsule containing a biodegradable polymer and risperidone, wherein the biodegradable polymer contained in the microcapsule has an Mw corresponding to 85% or more of an initial molecular weight (Mw) of the biodegradable polymer.
