Abstract: Disclosed is a self-tailored insole. The self-tailored insole comprises: an inner sole; and a hard member, attached to a lower side of the inner sole, transformable depending on a morphology of a user's sole, said hard member comprising: a heel portion which has a curved portion configured to allow the inner sole to closely contact with and support left, right and rear sides of a heel of the user, and an arch portion configured to allow the inner sole to closely contact with and support arches of a sole of the user, said heel portion and said arch portion being formed as one body, thus preventing the heel and the arches from being abnormally distorted upon locomotion.