To provide a yarn cutter capable of holding all the filaments without holding and regulating some or all of filaments not to deviate from a yarn guide in the case of holding the yarn made by binding plural filaments in holding the yarn.

A moving side yarn holding member 5 and a fixed side yarn holding member 7 made of elastic raw material such as rubber having a hardness of 55°-75° are provided as a runner 4 side yarn holding member. The end face of the yarn holding surface of the fixed side yarn holding member 7 is projected more than the end face of the yarn holding surface of the moving side yarn holding member 5. Accordingly, when both holding members 5, 7 of the yarn holding part abut on each other, the fixed side yarn holding member 7 is elastically deformed by the pressing force of the moving side yarn holding member 5, and changed into the shape of covering the bundle of filaments 19.