Continued heating caused further coagulation of egg and flour proteins, and strengthening of the cake structure continued until the end of baking. The PSD of rice flour affected the cake volume and the crumb structure. Because the ratio of starch granule fraction (2e40 mm) to the cell fraction was different from rice flour PSD (Fig. 1), the size of air cell and homogeneity in crumbs were not similar (Fig. 2).