To perform the mounting and removal of a clamp from an optional place regardless of the mounting position of the clamp, to strongly support a cable, while maintaining such conveniences that the prior setting of the clamp to the supporting metal fitting, and the temporary arrangement of the cable are available.

Clamps 6 for supporting cables are attached in multistage to a supporting metal fitting 1 which is provided with brackets 2 and 3 for fixation to be mounted to anchor bolts at both its ends, and the supporting metal fitting 1 is provided with a slit 4 along the center line. Each clamp 6 consists of a fixing member 7 and a mobile member 8 being coupled so that they can slide relatively via a screw means, both members 7 and 8 are equipped with curved surfaces 7a and 8a which are counterposed to hold the cable c, and the back of the fixing member 7 is provided with a hook 14 which is locked to the rear side of the metal fitting 1 by inserting the hook 14 from the slit 4 and turning the clamp 6 by 90°.