A medical treatment tool includes an elongated insertion section; a grasper supported by a distal end of the insertion section so as to be openable and closable; a generator disposed at a proximal end of the insertion section and generating a force to drive the grasper; a transmitter transmitting the force generated by the generator to the distal end of the insertion section; an amplifier amplifying the force transmitted through the transmitter; and a toggle amplifying and converting the force amplified by the amplifier into a force directed to open or close the grasper.