To provide a cutter capable of stably cutting knitting yarns, even when the cutting blade of the yarn cutting means is worn.

This cutter is provided with a dial cap 10, bracket 24 attached to the dial cap 10, and adjusting knob 32 whose screw section 45 is screwed into a hole 31 in the bracket 24 and brim 36, at the lower end of the screw section 45, fit to a yarn cutting means 37 at the end of its base. This constitution holds the yarn cutting means 37 while allowing it to rock in the vertical direction. An adjusting screw 35 is passed through a hole 25 in the bracket 24, and a circular section 30 at its lower end is inserted into a hole 40 in the yarn cutting means 37. The adjusting screw 35 is driven downwards by a spring 26 in such a way to keep only a cutting blade section 39 at the front end of the yarn cutting means 37 in contact with a circular cutter 15.