Two potato cultivars commonly used in Japan for processing, Toyoshiro and Norin-ichigo, were reconditioned at 16°C, and their sugar (glucose, fructose and sucrose) and starch contents within the tubers were measured at intervals during reconditioning. The aim of this study was to examine sugar distribution within the tubers during reconditioning. The experimental data revealed that the stem end area of both cultivars had 3. 8 and 1.1 times higher reducing sugar (glucose and fructose) and starch contents, respectively, than the bud end area during reconditioning.