Raw material rice (brown rice and partially-milled rice) is subjected to a preliminary pressurized steam-boiling process to form an alpharized layer on the surface of the raw material rice, and then a moisture adding process is performed. Since the surface of the raw material rice is alpharized to become stiff with the preliminary pressurized steam-boiling process, even rapid moisture addition does not cause a crack in the raw material rice. Therefore, water absorption can be quickly achieved to a target moisture content, thereby reducing a moisture adding time. Also, with no crack, quick-cooking rice with an excellent outer appearance of rice as a product and without a drain of nutrients in rice grains at the time of rice cooking.
