The clamping band has a simple structure and is capable of preventing crush of an engaging claw and buckle of an inner band part, which are caused when an outer band part and the inner band part are moved close to each other to reduce an inner diameter of a band section. In the clamping band, an overriding guide is formed between the engaging claw and a second tool-catching claw of the inner band part. The overriding guide is outwardly projected to radially outwardly guide an outer end of the outer band part when the engaging claw is moved to an engage hole from a temporary engage hole.