To provide a double spiral type metal clamp which can be contacted closely evenly and elastically in a high roundness, even to a fixed article with no elasticity, and has a flat form as a whole.

At the position where the inner superposed part 11a and the outer superposed part 11b of a clamp band 11 are overlapped threefold as a specific amount X through an intermediate superposed part 11c, it is set to bite and lock the first fixing pawl 18 directing to the inside from the outer superposed part 11b, and the second fixing pawl 22 directing to the outside from the intermediate superposed part 11c each other, while at the position overlapping doubly except for the specific amount X, the clamp band 11 itself is made to exercise the extension and contraction spring force in the diameter direction, by plural floating leg pieces 23 interposed between the circumscribed band area X1 and the inscribed band area X2 of the clamp band 11.