Use of plant resources in the Middle to Final Jomon periods (ca. 5,300-2,800 cal BP) at the Shimo-yakebe site in the Kanto Plain, central Japan, was studied based on starch typology on geometrical form and size from residue analyses. From the Shimo-yakebe site, forty charred plant remains adhering to the Jomon potteries were excavated and classified into five groups: scally bulb remains, fibre remains, fruit and seed remains, woven remains, and unidentified macro fossil remains. In this study, nineteen charred plant remains belonging to those five groups were examined to assess the preservation of starch residues. Starch preservation in these assemblages was well preserved, with features that resemble those seen in fresh specimens. Starch granules embedded in amorphous plant tissues were also found from residues of the potsherds. This can be the empirical evidence for containing tuber plants into charred remains. Each starch granule was classified according to morphological type based on a range of geometrical forms that correspond approximately to the range of variation seen in published images of starch and in comparative modern starch reference collection. The most common form was circular, and some of these circular forms showed characteristics of starch granules seen into nut and acorn species. The co-occurrence of polygonal form with other forms of starch may indicate the presence of more than two plant species cooked by sampled potteries. Thus, starch residue analysis can approach to the cooking method of plant foods using pottery in the Middle to Final Jomon periods.