A cleaning apparatus in which the contact point portion between the metal plate and rubber blade of a cleaning blade is made into a surface to thereby alleviate the concentration of stress in that portion and prevent the occurrence of the squat of the cleaning blade, and high cleaning performance can be maintained for a long period. The selector is connected to each item of the data stack and a register of the register set, such that, when the register set requires to exchange data with the data stack, the selector is controlled and the stack pointer is updated thereby the selector is switched to make the stack item pointed by the stack pointer communicate with the register. The planer platform has a cutout extending therethrough. In an implanted state, the backing section bears against a head of the stapes and prevents a formation of a hollow space between the stapes and an inner surface of the receiving space in an axial extension of the elongated prosthesis body.