Insole manufacturing method

A method for manufacturing an insole, comprising:

• a first step of forming a footprint resin portion having a footprint shape and a predetermined thickness using a thermoplastic resin which melts at a predetermined temperature;
• a second step of performing shrink processing such that the footprint resin portion is covered with a film, and thereafter vacuum packing the footprint resin portion covered with the film in a nylon polyethylene bag, wherein the film covers the whole surface of the footprint resin portion and is shrunk while air is removed to seal the footprint resin portion;
• a third step of heating to melt the sealed footprint resin portion manufactured through the first step and the second step at a predetermined temperature;
• a fourth step of attaching the heated and sealed footprint resin portion melted by the third step to the inside of a shoe of a user, and hardening the footprint resin portion by leaving the footprint resin portion to stand inside the shoe for a predetermined time period while the user is wearing the shoe;
• and
• a fifth step of peeling the film from the hardened footprint resin portion after the third step and the fourth step, and thereafter attaching a flexible sheet portion to a side of the footprint resin portion to be in contact with the user's sole.