The present invention is a conventional injector treatment tool that allows you to inject a chemical solution to the internal organs and tissues of the body relates to the improvement of, the body of the internal control and the treatment unit for the required action to be injected into the drug solution for organs and tissue, the treatment portion is inserted into the needle unit for injecting a chemical solution to the internal organs and tissue of the body and a coupling with the needle tip portion and is composed of a liquid injector which comprises a drug solution to be injected into the internal organs and tissues of the body. In other words, the injector of the present invention for endoscopic treatment and aid the body mechanisms provided in the needle insertion projection sphere and the other end to one end, insert the projections provided at the end of the treatment the body is composed of combination treatment tube that is inserted into the treatment portion and the Church doedoe inside the insertion portion, a needle portion formed integrally with the needle in the engagement groove and the other end to one end chemical injection unit is provided with the engaging projection is engaged with the engaging groove formed in one end portion with the needle by being composed of a needle portion removable and can be combined home and needles by injecting a chemical solution injected additional negative coupling protrusion portion and chemicals attached freely, unlike a conventional disposable injector aid organizations to replace all of the treatment portion of the injector needle after injection treatment tool section after the procedure also can be reused by replacing only. Further, the scoring unit can be prevented by being treated tubes have a plurality of projections on the outer tube formed adjacent one another, the completely folded or can be folded smoothly without being bent or curved needle that is inserted into the interior of the treatment unit is d
