A medical treatment tool includes a treatment section which has a pair of treatment tool pieces that is rotatably supported with respect to a substrate, a manipulating member which rotates the pair of treatment tool pieces, and opens and closes the pair of treatment tool pieces, a link member which has a first end and has a second end, a coupling member which couples the link member and the manipulating member at the second end a movement indicating part which moves interlocking with a movement of the coupling member in an advance and retraction direction of the manipulating member and is provided so that an amount of movement with respect to the substrate is visually recognized from an outside of the substrate and a reference index part which is provided at the substrate and refers to a amount of relative movement of the movement indicating part to the substrate.
