To turn an object surely and safely by providing with an inner cylinder which can move up and down and which is rotatably in an outer cylinder whose upper part is opened, a fluid supplying means for supplying the fluid into the inner cylinder passing the outer cylinder, and a rotary plate for mounting an object arranged on the upper end of the inner cylinder.

A cylindrical outer cylinder 7 whose upper part is opened is fixed to the center of an installing plate 6, and a flange part 8 is formed on the upper end of the outer cylinder 7. A pipe 10 formed as a fluid supplying means is penetrated and connected to the bottom part of the outer cylinder 7. An inner cylinder 11 is housed in the outer cylinder 7 at a fine clearance freely to move up and down and freely to rotate. The inner cylinder 11 whose upper and lower parts are opened is formed in a cylindrical shape, a rotary plate 16 is water-tightly arranged on the upper end of the inner cylinder 11, a coupling disk 17 is arranged so as to cover on the rotary plate 16, and an object 20 is mounted on the upper surface of the coupling disk 17 through a base seat 19. It is thus possible to turn the object 20 surely and safely.