A therapeutic instrument comprising: a support member having a tongue-shaped supporting portion for supporting a sheet-like therapeutic agent; a nozzle member having a cylindrical portion in which the supporting portion supporting the therapeutic agent can be housed, and having an opening on a tip of the cylindrical portion, through which the supporting portion can be loaded and unloaded in/from the cylindrical portion; a positive pressure generator that adds a positive pressure in the cylindrical portion for pushing-out the therapeutic agent housed in the cylindrical portion together with the supporting portion, to outside the cylindrical portion through the opening; and a water flow forming part that forms a water flow at a place where the supporting portion and the therapeutic agent are faced each other, when a medical water is fed into the cylindrical portion in a state in which the therapeutic agent is housed in the cylindrical portion together with the supporting portion, characterized in that the water flow forming part includes a first notch formed on a tip of the cylindrical portion, and a second notch formed on a tip of the supporting portion so as to correspond to the first notch, and overlapped on the first notch in a state in which the supporting portion is housed in the cylindrical portion, and is configured to form a water flow at a portion where the supporting portion and the therapeutic agent are faced each other, when a medical water is fed into the cylindrical portion from a place where the first notch and the second notch are overlapped on each other in a state in which the supporting portion supporting the therapeutic agent is housed in the cylindrical portion. a nozzle member having a cylindrical portion in which the supporting portion supporting the therapeutic agent can be housed, and having an opening on a tip of the cylindrical portion, through which the supporting portion can be loaded and unloaded in/from the cylindrical portion; a positive pressure generator that adds a positive pressure in the cylindrical portion for pushing-out the therapeutic agent housed in the cylindrical portion together with the supporting portion, to outside the cylindrical portion through the opening; and a water flow forming part that forms a water flow at a place where the supporting portion and the therapeutic agent are faced each other, when a medical water is fed into the cylindrical portion in a state in which the therapeutic agent is housed in the cylindrical portion together with the supporting portion, characterized in that the water flow forming part includes a first notch formed on a tip of the cylindrical portion, and a second notch formed on a tip of the supporting portion so as to correspond to the first notch, and overlapped on the first notch in a state in which the supporting portion is housed in the cylindrical portion, and is configured to form a water flow at a portion where the supporting portion and the therapeutic agent are faced each other, when a medical water is fed into the cylindrical portion from a place where the first notch and the second notch are overlapped on each other in a state in which the supporting portion supporting the therapeutic agent is housed in the cylindrical portion.