A tablet that contains a metal chlorite, a chlorine-releasing compound that releases chlorine upon contact with water, a solid acid source, a metal stearate, and a macromolecular disintegrant, with the metal stearate and the macromolecular disintegrant constituting a total of 0.3-10 wt.% of the entire tablet, makes it possible to generate a sufficient concentration of chlorine dioxide in a practical amount of time regardless of the size of the facility to be treated, is strong enough that breakage during handling, e.g. transport or packaging, does not occur, and can be produced with high yield.
