To gradually reduce and finally eliminate the joining clearance, and to easily regulate the excessively small bearing pressure between parts to the prescribed level by providing a plurality of parts having the angular-deviated wedge profile specific to the cylindrical shape, relatively turning the parts, and changing the relative angular position.

A machine tool is provided with a guide pole 4 extending in the vertical direction to communicate a bottom box with a top box, and a slide is assembled in a elevating/lowering manner along the guide pole 4. The guide pole 4 is provided with a profile 10, a profile 11 is also formed on a bush 15 attached to a guide hole in the slider 5 corresponding to the profile 10, and the profiles 10, 11 are formed of three wedges 12 deviated by the angle of 120°. The bush 15 is locked to the slider 5 by a bolt 18, and when the slider 5 is positionally fixed, the bush 15 is turned in the circumferential direction to obtain the fixed condition by the wedge effect between the profiles 10, 15.