To provide such a clamp that the pitch of a pair of projecting clamps of a body is adjustable and flexibly applicable to the complicated surface.

This clamp comprises a flat frame container 12, which contains and holds a plurality of wires W in parallel, and at least a pair of clamps 13A, 13B which are projecting widthways in parallel outside the above container 12 so to fix the outside of a wide width side of the container 12 to a loading members B along its attaching surface. On the outside of the above container 12 at the area between the pair of clamps 13A, 13B, slits 19 are formed so as to extend in the axial directions of the holding wire W and the pitch 12 between the pair of clamps 13A, 13B is extendable in the width directions for the slits 19.