To improve productivity and to keep strength high by a method in which a mixture of powder containing cement mixed with reinforcing fibers as a main component and water is kneaded and granulated by a granulator, and the granules are set in a mold and compression-molded.

An inorganic board is produced by a method in which a mixture of powder 3 containing cement mixed with reinforcing fibers 2 as a main component and water is kneaded and granulated by a granulator, and the granules 1 are set in a mold and compression molded. Strength improved by the incorporation of the reinforcing fibers 2. In the granulation of the powder 3, by kneading the powder 3 in the presence of the granules 1, the uniformity of the obtained granules 1 is improved because of good dispersion of the powder 3. Accordingly, the produced board with high, stable precision of dispersion has enough strength.