A medical treatment tool comprises: a flexible wire a first wire holding member which holds the wire a second wire holding member capable of holding the wire between itself and the first wire holding member a first sheath which is provided in contact with a proximal side of the second wire holding member a second sheath which is provided in a back-and-forth movable manner with respect to the first sheath and a sheath operation portion which operates the second sheath. The first wire holding member and the second sheath have a connection device for connecting them to each other the first wire holding member and the second wire holding member have a latching device which latches them to each other when holding the wire there between, and a cutting device which cuts the wire and the second wire holding member has a connection releasing device which releases the connection of the connection device, when latched by the first wire holding member.
