To provide a shank with a function of independently supporting and reinforcing the inside and the outside arch as well as a function of a cushion in the part corresponding to a heel.

A resin plate comprising the shank is divided into an inside arch counter and an outside arc counter, with the front arch counter made a raised structure. and at least one through hole is provided on the part of the resin plate corresponding to the heel in the thickness direction. Depending on a desire, a through hole is also provided on a mid sole, an intermediate sole and an insole, and is made to communicate with the through hole formed in the part of the resin plate corresponding to the heel; thus, an air conditioning system is constituted inside a shoe.