Abstract: The invention is a method of making a novel spherical form of granulated products that can be effectively used in various product forms in drug, fertilizer, foodstuff, feed, agricultural chemical, catalyst, ceramics, powder metallurgy, detergent, plastic, and bio-material fields, for instance, as catalysts, lightweight materials, sound-insulating materials, microcapsules, and lightweight aggregates. To obtain a granulated product which is a spherical solid shell having a spherical space therein, a polymer having high water absorption properties is swollen by the absorption of water therein, and then brought in contact with a powder to form a powder layer all over the surface of the swollen polymer particle. This spherical particle is then dried and fired if necessary.