Abstract: The present invention relates to an efficient production method of a medicament-containing particle. According to the present invention, it is possible to provide a method for producing a hollow particle composed of a shell and a hollow, wherein the shell contains a medicament and a polymer, the method including a step of adding a polymer and a solvent capable of dissolving the polymer to a powder containing a medicament while rotating a container and a stirring blade by using a rotating mixing pan, and granulating the mixture by rotating the container and the stirring blade of the rotating mixing pan, wherein the polymer used as a starting material has an average particle size of not less than 5-fold that of the medicament used as a starting material.