PROBLEM TO BE SOLVED: To provide a needle which reduces the discharge part being stopped up by skin tissue to secure stable discharge flow, and also to provide a needle puncture unit and a liquid injection apparatus which use the same.SOLUTION: Provided is a needle 3 which is pierced into a living body and injects liquid into the living body, including: a distal end 33 which reaches a subcutaneous layer 63 of the living body; a discharge part (discharge port 321) which discharges the liquid toward the dermal layer 62; and a tubular part 31 which guides the liquid to the discharge port 321. The distal end 33 includes a blade 332 which acts as an edge in a piercing direction. The distal end 33 is solid. The blade 332 is line symmetric with respect to the center axis of the tubular part 31 and the most distal end 333 is formed acute.SELECTED DRAWING: Figure 8ACOPYRIGHT: (C)2018,JPO&INPIT【課題】吐出部が皮膚組織によって塞がることを低減し、安定した吐出流量を確保する針、針穿刺ユニット、および液体注入装置を提供する。【解決手段】針は、生体へ穿刺されて生体へ液体を注入する針3であって、生体の皮下層63に達する先端部33と、生体の真皮層62に向けて液体を吐出する吐出部(吐出孔321)と、吐出孔321へ液体を導く管状部31と、を備え、先端部33は、穿刺方向に刃として機能する刃部332を有している。先端部33は中実で、刃部332は、管状部31の中心軸に対して線対称で、最先端部333が尖鋭に形成されている。【選択図】図8A