PURPOSE: A buffer for footwear is provided to form an air stream passage cross section reduction unit of different various types on an air channel. CONSTITUTION: The air of a predetermined volume is charged in a front air room and a rear air room. An air flow path(40) interlinks the front air room and the rear air room. The front air room and the rear air room are shrunk or swelled by the pressure of a front foot unit and a rear foot unit of a wearer. An air flow path section reduction unit prepares in the air path. The air flow path section reduces the section of the air path.
