A clip comprising a self-opening clip body having a clipping part at a tip and equipped with a twin-arm part extending from a basal part, and a securing ring, wherein the self-opening clip body has a first concave part on a clip basal end, and a second concave part between the first concave part and a clip tip part, respectively, and the securing ring is mounted in the first concave part and, at the same time, sliding-moved with an external force from a mounting position in a first concave part to be mounted in the second concave part, which is used as a treating equipment for an endoscope which closes a clipping part of a tip of the clip body.
