A medical instrument is that the first holding portion or the second holding portion is capable of moving so that a distance between a distal end of the first holding portion and a distal end of the second holding portion changes from a first dimension which is larger than a diameter of the wire to a second dimension which is smaller than the diameter of the wire and the space is formed by the first holding portion and the second holding portion such that the wire is capable of rotating about a line connecting a first contact point where the first protrusion portion contacts with the wire with a second contact point where the second protrusion portion contacts with the wire.