PROBLEM TO BE SOLVED: To provide an injection needle having a wall thickness that can be formed to be thin while keeping strength.SOLUTION: An injection needle 1 in this invention is attached to a distal end of an injection syringe used for the administration of a medicinal solution or the suction of blood or the like, and is constituted of: a distal end portion 2 which is located on the opposite side of an attachment side of the injection syringe and has a diameter gradually reduced toward a distal end 20 and a cylindrical portion 3 which is located between the distal end portion 2 and the attachment side of the injection syringe. The injection syringe includes an opening portion 4 opened on the distal end portion 2 and/or on a side surface of the cylindrical portion 3. At least one reinforcing projection 5 which projects from an inner peripheral surface 30 in a center direction of the cylindrical portion 3 and extends in an axial direction of the cylindrical portion 3 for increasing strength of the cylindrical portion 3 is formed on the inner peripheral surface 30 of the cylindrical portion 3.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2016,JPO&INPIT【課題】 この発明は、強度を維持しつつ壁厚を薄く形成できる注射針を提供することにある。【解決手段】 本発明の注射針1は、薬液投入若しくは血液等の吸引に使用される注射器の先端に装着されるもので、該注射器の装着側と反対側に位置し、先端20に向かって漸次縮径する先端部2と、該先端部2と注射器の装着側との間に位置する円筒部3とによって構成され、前記先端部2及び/若しくは円筒部3側面に開口する開口部4を具備する注射器において、前記円筒部3の内周面30に、該内周面30から円筒部3の中心方向に向けて突出すると共に前記円筒部3の軸方向に沿って延出し、前記円筒部3の強度を向上させる少なくとも1つの補強突条5が形成されたものである。【選択図】 図1
