A medical treatment tool comprises: a flexible wire (50) a first wire holding member (52) which holds the wire (50) a second wire holding member (53) capable of holding the wire (50) between itself and the first wire holding member (52) a first sheath (54) which is provided in contact with a proximal side of the second wire holding member (53) a second sheath (55) which is provided in a back-and-forth movable manner with respect to the first sheath and a sheath operation portion (56) which operates the second sheath (55). The first wire holding member (52) and the second sheath (55) have a connection device for connecting them to each other the first wire holding member (55) and the second wire holding member (53) have a latching device which latches them to each other when holding the wire (50) therebetween, and a cutting device (59) which cuts the wire (50) and the second wire holding member (53) has a connection releasing device which releases the connection of the connection device (59), when latched by the first wire holding member (52).
