PROBLEM TO BE SOLVED: To provide a puncture needle which can be punctured to the skin, is excellent in indorence when punctured, and is capable of sampling a body fluid or administering a liquid chemical, and a tool for sampling trace body fluid and a tool for trace liquid chemical administration using it.SOLUTION: A puncture needle N includes: a tapered needle tip part 1 of a length equal to or shorter than 200 μm from the distal end and a solid columnar needle base part formed continuously to the needle tip part 1 and having a diameter of 50 to 100 μm. The needle base part 2 has a plurality of ring-like outer peripheral grooves 3 on the outer periphery, a groove width 5 in the axial direction of the outer peripheral groove 3 is 10 to 60 μm, and a ratio K to the groove width 5 of a length 6 in the axial direction of a part 4 without the outer peripheral groove of the needle base part is 0.6 or greater. A tool for sampling trace body fluid and a tool for trace liquid chemical administration use it.COPYRIGHT: (C)2014,JPO&INPIT【課題】皮膚に穿刺することができ、穿刺時の無痛性に優れた体液の採取あるいは薬液の投与が可能な穿刺針およびそれを用いた微量体液採取用冶具および微量薬液投与用冶具を提供する。【解決手段】先端から200μm以下の長さの先細状の針先部1と、針先部1に連続して形成された、直径が50~100μmの中実円柱状の針基幹部2とを備え、針基幹部2は、その外周に複数のリング状の外周溝3を有し、外周溝3の軸方向における溝幅5が、10~60μmであり、針基幹部の外周溝のない部分4の軸方向における長さ6の溝幅5に対する比率Kが0.6以上であること、を特徴とする穿刺針N、およびそれを用いた微量体液採取用冶具および微量薬液投与用冶具。【選択図】図2
