To provide a grinding means capable of being operated for a long period of time without an interruption, grinding a cutting blade with a grinding surface without a flaw in such a case, increasing its productivity and reducing its maintenance expenditure as a result of reducing the number of stopping of a loom.

This grinding device is equipped with a grinding belt 4 having a grinding surface capable of being arranged so as to make a cutting blade 12 in contact with the grinding surface during its movement and also freely transferrable so as to transfer the various areas of the grinding surface within a reaching range of the cutting blade 12. The grinding belt 4 is delivered from a reel 7 and arranged as capable of being wound up on the reel 3, and the grinding belt 4 wound up on the reel 7 is delivered by a driving of a first reel 3.