According to the present invention, a surgical therapeutic instrument (1) includes an insertion unit (2), a treating unit (4) that is arranged at one end of the insertion unit to be extended in the extending direction at a predetermined angle to the axial direction of the insertion unit, and an operation unit (3) that is arranged at the other end of the insertion unit. The operation unit includes a rotating operation unit (6) to rotate the treating unit, and an opening/closing operation unit (5) to open/close the treating unit. The treating unit includes two pinching members having planar portions, is rotatable in accordance with the rotating operation, and can move at least one of the two pinching members in the direction substantially orthogonal to the plane of the planar portion in accordance with the opening/closing operation.
