To efficiently remove deposits adhered to an inner surface of a cylindrical form and coupling flange surface after releasing from the form.

An elevator 11 is arranged at an upper site of a form conveyor 1 for conveying a cylindrical form A to be divided into upper and lower forms. And, an arm material 17 is arranged toward obliquely downward at the elevator 11. A threaded rod 19 is arranged between the material 17 and the elevator 11. And, brush supporting bearings 20, 20' are mounted at the rod 19. An inner surface cleaning brush 23 is arranged at the bearings 20, 20' via a link material 22. And, the brush 23 is rotated to remove deposit of the form. And, the bearing 20 is moved along the rod 19 by rotation of the rod 19. Thus, an angle of the material 22 is changed for the brush 23 to be radially movable of an inner surface of the form. And, a rotating radius of the brush 23 is regulated.