As it is obliged that the cultivars, location and year of production should be displayed on the bag of milled rice grains, a powerful technique to identify them by objective methods is indispensable. Milled rice grains produced at the several agricultural experiment stations were subjected to the RAPD method. Each DNA was extracted by the CTAB method and amplified by the PCR method using 10 mer primers. It became possible to identify the cultivars by electrophoresis of the PCR products among the dominant 10 cultivars in Japan.