To fasten a hose in a requested position by providing an annular body, an annular fastening means, and a positioning means extended from one side or both sides of the annular body.

An annular body 2 is composed of two annular wires 2A, 2B, and thereaded brackets 31, 31' are fastened to the end parts of the annular wires 2A, 2B. A space between the threaded brackets 31, 31' can be changed by rotating a screw 32 so as to enlarge and contract the annular body 2. A positioning means 4 is fixed to one side of such an annular body 2. In case of fastening a hose of a tube using a clamp 1, the clamp 1 with the annular body 2 loosened is passed through the tip part of the hose, and the tip part of the tube is inserted in the hose. A tip part 41 of the positioning means 4 is then engaged with the tip of the hose, and in this position, the screw 32 is turned to fasten the tube and hose by the clamp 1.