To simply and surely discharge foreign matter such as wire fragments 26 get mixed on a lower curl guide 10.

In a reinforcement binding machine 1, a curl guide 5 forming a winding tendency to a wire 4 for a binding from a wire reel and forwarding the wire for the binding to a lower section and the lower curl guide 10 receiving the wire 4 and guiding the wire 4 to the upper curl guide 5 again are projected and arranged from the front end of a binding machine body 2 while the base section of the lower curl guide 10 is fitted rotatably to a lower section to a support shaft 23 fitted to the front section of the binding machine body 2. In the reinforcement binding machine 1, a section fronter than the base section of the lower curl guide 10 is fitted so as to be projected to a front from the lower section of a curl-guide cover 24 formed to the front section of the support shaft. In such a reinforcement binding machine 1, an opening section 25 opened to the section fronter than at least the curl-guide cover 24 is formed to the lower curl guide 10, and the foreign matter get mixed on the lower curl guide 10 are discharged from the opening section 25.