The present invention relates to an inside processing apparatus for performing operations of cleaning, grinding, cutting and the like toward an inside of piping of a water pipe, a gas pipe, a wire pipe and the like. The said inside processing apparatus is constituted by possessing a working head having the working member (tool) for performing a fixed work on the cylindrical wall surface, a driving mechanism for moving the said working member in the circumferential direction of the cylindrical wall surface and a cutting controlling mechanism for controlling a quantity of the movement in company with a fact that the said working head is moved in the radial direction of cylindrical wall surface by the said driving mechanism.