Reflecting the population growth in Asian countries where more than 90% of rice is produced and consumed, the quality of rice during storage is increasing in importance. The quality of rice during storage is affected by storage temperature, rice moisture content, and the gas composition surrounding the rice, and the optimal storage conditions are decided using rice quality indicators. Commonly used rice quality indicators include fat acidity, germination rate, and microorganisms on rice grain. Fat acidity is one of the most useful indicators because of its high responsiveness to the deterioration of rice quality. In one report, the germination rate and number of microorganisms did not change at 15 C even after 6 months, while the fat acidity increased remarkably