Many of the low molecular compounds in fermented food are odor and taste-active and they constitute the flavor. Sake is a Japanese traditional alcoholic beverage which is produced by simultaneous saccharification and alcohol fermentation of polished and steamed rice by Aspergillus oryzae and Saccharomyces cerevisiae (1). This multiple parallel fermentation process is unique to sake brewing and generates various low molecular weight compounds that constitute the complex flavor of sake. A recent study on sensory analysis arranged flavor terminology system with 86 terms representing the attributes independently perceivable in sake (2).