Abstract: A new manufacturing method produces an insole that fits a user's foot properly and that is manufactured in a shorter time at a lower cost. The manufacturing method includes steps of: acquiring information on a user's foot by a foot printer; selecting a basic part 2 based on the acquired information; attaching various modification parts 3 to the selected basic part 2 arranged in a trial shoe 1; determining whether the trial insole including a combination of the basic part 2 and modification parts 3 is properly fitted to the user's foot in walking and standing statuses; repeating the steps from selecting to determining until the most fitting combination of the basic part and modification parts is determined; reproducing the determined trial insole in a three-dimensional CAD based on the most fitting combination; and manufacturing an insole by cutting out material based on the reproduced trial insole in the three-dimensional CAD.