PROBLEM TO BE SOLVED: To provide a needle puncture unit and a liquid injection device capable of easily performing puncture to a desired position and capable of performing stable administration of liquid to an intradermal tissue.SOLUTION: A needle puncture unit 100 includes a needle part (an injection needle 150) inserted into a viscoelastic body (a skin 60 of a living body), a first member 110 for holding the injection needle 150, a second member 120 for storing the first member 110 slidably, and a first regulation part and a second regulation part for regulating the sliding of the first member 110. The first regulation part regulates the limit of the sliding of the first member in a direction that the injection needle 150 is inserted by external force, and the first regulation part regulates the limit of the sliding that returns to a direction opposite to the direction of the external force, by reaction force from the skin 60.SELECTED DRAWING: Figure 4COPYRIGHT: (C)2017,JPO&INPIT【課題】所望する位置への穿刺が容易に行え、皮内組織への安定した液体の投与が可能な針穿刺ユニット、及び液体注入装置を提供する。【解決手段】針穿刺ユニット100は、粘弾性体(生体の皮膚60)に穿刺される針部(注入針150)と、注入針150を保持する第1部材110と、第1部材110を摺動可能にして収納する第2部材120と、第1部材110の摺動を規制する第1規制部および第2規制部と、を備え、第1規制部では、外力によって注入針150が穿刺される方向への第1部材の摺動の限界が規制され、第2規制部では、皮膚60からの反力によって外力の方向とは反対の方向へ戻る摺動の限界が規制される。【選択図】図4
