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We propose a novel method of generating a 3D virtual foot model with use of a measuring technique based on multiple camera image data. Our method costs very low and a 3D virtual foot model for each person can be generated easily and rapidly with acceptable error range. We have to estimate the cause of errors that can occur in the whole process and endeavor to lower the errors. The errors are mainly classified into two kinds. One occurs in transforming process with use of our original free deformation method called GFFD and the other in obtaining 3D coordinates of feature points. So, we devoted ourselves to do enough experiments and get to know how errors occur in each process.