The endoscopic injection needle of the present invention is a needle tube having an outer sheath, an inner sheath and a distal end portion of the inner sheath, and a distal end capable of projecting from the distal end of the outer sheath by the advance of the internal sheath, and the stopper and the same material as the outer sheath Formed in the body and protruded radially inward from the inner peripheral surface of the outer sheath at the tip end of the outer sheath and connected to the proximal end portion of the anchor sheath and the proximal end of the inner sheath to be connected to the proximal end of the sheathThe moving member is provided with an operating member for moving the inner sheath back and forth relative to the outer sheath by being moved, and in a straight state, the movable member is able to move the operating member in such a state that the stopper is separated from the engaging abutting portion The first range of movement and the second range in which the operating member moves with the stopper abutting against the engaging abutting portion, the length of the second range is greater than the difference between the inner diameter of the outer sheath and the outer diameter of the inner sheath BeforeThe thickness of the notched portion in the longitudinal axis direction is thicker than the radial thickness of the inner sheath and the thickness of the outer sheath.本発明の内視鏡用注射針は、外シースと、内シースと、前記内シースの先端部に位置し、前記内シースの進退によって前記外シースの先端から突出可能な先端部を有する針管と、ストッパと、前記外シースと同種材料で一体に形成され、前記外シースの先端部において前記外シースの内周面よりも径方向内側に突出し、前記ストッパと当接可能に構成された係止用当接部と、前記内シースの基端部に接続され、前記内シースの長手軸方向に移動されることで、前記内シースを前記外シースに対して進退させる操作部材と、を備え、ストレート状態において、前記操作部材の移動可能な範囲は、前記ストッパが前記係止用当接部から離間した状態で前記操作部材が移動する第1の範囲と、前記ストッパが前記係止用当接部と当接した状態で前記操作部材が移動する第2の範囲と、からなり、前記第2の範囲の長さは、前記外シースの内径と前記内シースの外径との差の値よりも大きく、前記係止用当接部の前記長手軸方向の厚さは、前記内シースの径方向の厚さ及び前記外シースの径方向の厚さよりも厚い。
