One of the important factors in the use of rice for sake brewery is represented by the characters of the white-core in kernels. Rice breeders and sake brewers require information about the size and position of the white-core in grains of rice cultivars for sake brewery. However, it had hitherto been difficult to obtain the information, because the size and position of the white-core in grains vary with the cultivars. We reported that the evaluation of the size and position of the white-core is possible by using image analysis, in which the standard image for a cultivar was obtained by superimposing the image of 85 grains (1996). In this study, we aimed at detecting the difference in the white-core characters in grains among rice cultivars for sake brewery by using the standard images. It was reported that the size of the white-core correlated wath the thickness of the rice kernel. Then we classified the grains into 5 groups according to their thickness and made the standard image of each group. The results showed that the size of white-core correlated with kernel thickness, i. e. the thicker the grain, the greater the size of the white-core. On the other hand, the positions of the white-core in grains did not differ among the 5 groups (Fig. 2, 3). Therefore, the standard images of 34 cultivars were obtained, using grains more than 2.0 mm thick from rice plants cultivated in Nagaoka city, Niigata prefecture in 1995. Based on the comparison of the 34 standard images, we classified the cultivars into 5 categories (Fig. 4). Then we reviewed the genealogical tree of the rice cultivars for sake brewery based on the literature, and investigated the relationship between the lineage and the characters of the white-cores. It was found that the cultivars which were closely related gave a similar standard image (Fig. 5). These findings support the assumption that characters of the white-core are genetically controlled. The results obtained suggest that the method of evaluation applied is not valid for the selection of raw materials for sake brewery, but also could be used as an index of breeding.