PURPOSE: To efficiently produce the subject high purified rice starch useful for papermaking, cosmetics, etc., at a low cost, by carrying out grain polishing of rice grains, then removing the outside tissue, arranging the grains in a speci fied size, subsequently passing the grains through a crusher and passing the obtained crushed granules to a liquid cyclone, etc.

CONSTITUTION: Rice grains are subjected to grain polishing using a rice milling machine, and the outside tissue of the rice grains 7, i.e., pericarps 1 and seeds 2 are removed. The obtained grains are then subjected to a grinding type crusher such as a stamp mill, or a grinding mill, and passed through a sieve to arrange the resultant granules to a size of ≤30μm. Furthermore, the obtained granules are subjected to a high-pressure hydraulic machine such as a homogenizer while suspended normally in 10W50 times amount of water and the resultant crushed granules are passed through a liquid cyclone or a slit type sieve with about 5μm slits to remove finely powdered impurities.