To provide a method for making antimicrobial pottery having antibiotic properties excellent in durability which can do the anti-bacterium processing at low cost for sanitary ceramic ware that has to use an expensive silver material voluminously and the tile, etc., for which antimicrobial performance in a past anti-bacterium processing method is not exhibited easily because it is calcined at a high temperature, and the antimicrobial pottery.

The antimicrobial composition for glaze includes at least one silver material chosen from among metallic silver, oxidized silver and sparingly soluble silver salts, and 50-500 pts.mass of at least one powder chosen from among inorganic oxides whose melting point is 2,000°C or higher and specific surface area is desirably 90 m²/g or less. The anti-bacterium processing method makes the composition present on the surface of pottery and calcines it.