PROBLEM TO BE SOLVED: To provide an injection needle capable of easy puncture into the skin and securely relieving the pain at the time of puncture.SOLUTION: The injection needle 1 has blade faces 3 having first and second inclined faces 3a and 3c inclined to the axis S of a needle cannula 2 from one side D1 in the direction of diameter at the distal end of the needle cannula 2 toward the other side D2 in the diameter direction at the proximal end 2c of the needle cannula 2. A pair of notched faces 5, which configure a pair of linear cutting blades 3d crossing the second inclined face 3c at an acute angle as seen from a cross sectional face and crossing the distal end 2b of the needle tip 4 at an acute angle as seen from the top, are disposed at both outer peripheral edges on the distal end side of the second inclined face 3c and located on both sides of the center face, the plane including the axis S of the needle cannula 2 in the diameter direction, on the rear side of the second inclined face 3c on the distal end side of the needle tip 4.COPYRIGHT: (C)2008,JPO&INPIT【課題】皮膚への刺入が容易であり、刺入時における痛みを確実に軽減する。【解決手段】注射針１は、針管２の先端における一直径方向の一側方Ｄ１から針管２の基端側２ｃにおける前記一直径方向の他側方Ｄ２に向けて針管２の軸線Ｓに対して傾斜した第一、第二の傾斜面３ａ，３ｃを有する刃面３を備え、針先４の先端側における第二の傾斜面３ｃの裏側には、該第二の傾斜面３ｃの先端側の両外周縁に、横断面視で第二の傾斜面３ｃに対して鋭角に交差し、平面視で針先４の先端２ｂで鋭角に交差する一対の直線状の切刃３ｄを形成する一対の切欠面５が、一直径方向において針管２の軸線Ｓを含む平面である中心面の両側に位置して設けられた構成とされている。【選択図】図１
