To obtain the subject product produced by the rice-washing step, pressurized water treatment step, gelatinization and drying step, disinfection step, etc., by respective specific methods, free from the body breakage of the rice grain, having excellent palatability and preservability and dispensing with the temperature control in distribution stage.

Refined rice grains are vibrated with an ultrasonic vibration plate to remove the powder from the surface of the rice. The rice subjected to the above polishing treatment is added with water, washed by an ultrasonic vibration plate to remove the powdery component and dried to a water content of 10-15%. The dried rice is exposed to a pressurized water of 5-20atm to increase the water content to 40-45% and dehydrated to a water content of 30%. The dehydrated rice is gelatinized and dried by a far infrared drier to a water content of 23-25% and sterilized by ultraviolet irradiation. The sterilized rice is packed in vacuum. Preferably, a deoxidation agent is sealed together with the rice in the vacuum packaging to prevent the oxidative degradation, etc., of the rice.