To provide a grinding material which is environment-friendly, shows excellent sterilizing, preventing, disinfecting, and deodorizing effects or the like, improves the grinding, and shows selectivity.
A plurality of particle/powdered bodies 3, 4 of wood and bamboo charcoal immersed in water in advance and crushed, aggregates made of inorganic silica 7 of a rigid balloon type, a pyroligneous/bamboo acid 5, a foaming agent 8, an antalkali 6, a binder substance of cement 2, and water are mixed at a constant rate, and the mixed substance is poured into a prescribed mold form. A hardened film coating a surface 1a of a plate body 1 of the grinding material A formed by hardening and making the mixed substance into one body of an arbitrary shape and dimensions is removed. The particle/powdered bodies 3, 4 of wood/bamboo charcoal or the like, the pyroligneous/bamboo acid 5, and protrusions 7a of particles of a hollow body close to a spherical shape are exposed on the surface 1a.