To facilitate the chucking operation of fastening force capable of preventing a work from being deformed, and enable the chucking operation of fastening force to be stably repeated.

This vice is provided with a main body 11 having a fixing side ferrule 13, a movable body 15 provided for the main body 11 in such a way that it can be approached to/separated from the fixing side ferrule 13, and with the movable side ferrule 16 provided for the movable body 15 in such a way as to be faced to the fixing side ferrule 13. The movable side ferrule 16 is formed out of a first ferrule 161 and a second ferrule 162 arranged in the direction of approaching and separation. The first ferrule 161 is fixed to the movable body 15, and the second ferrule 162 is supported in such a way that it can be moved in the direction of approaching and separation with respect to the first ferrule 161. The second ferrule 162 can be moved by a adjusting means 18 in the direction of separation from the first ferrule 161 to adjust fastening force applied to a work interposed between the second ferrule 162 and the fixing side ferrule 13.