PROBLEM TO BE SOLVED: To provide a liquid administration tool allowing liquid administration with low invasion.SOLUTION: A liquid administration tool 100 includes: an internal cylinder 3 capable of filling liquid a puncture needle 7 having a double-ended needle 71 having a sharp tip side needle tip 711 on the tip an operation member 5 for performing discharge operation for discharging liquid from the double-ended needle 71 a cover member 6 movable between a position (A) of covering at least the tip side needle tip 711, and a position (B) of exposing the tip side needle tip 711 and an external cylinder 4 prohibiting the movement of the operation member 5 while the cover member 6 moves to the position (B), and releasing the prohibition of the movement of the operation member 5 by rotating when the cover member 6 is positioned in the position (B) and a torque transmission preventing mechanism 10 for preventing the torque from being transmitted to the puncture needle 7 when the external cylinder 4 rotates.COPYRIGHT: (C)2015,JPO&INPIT【課題】液体の投与を低侵襲で行うことができる液体投与具を提供すること。【解決手段】液体投与具100は、液体を充填可能な内筒3と、先端に鋭利な先端側針先711を有する両頭針71を有する穿刺針7と、液体を両頭針71から吐出させる吐出操作を行なう操作部材5と、少なくとも先端側針先711を覆う位置(A)と、先端側針先711が露出する位置(B)との間を移動可能なカバー部材6と、カバー部材6が位置(B)に移動するまでの間、操作部材5の移動を禁止し、カバー部材6が位置(B)に位置しているときに回転して、操作部材5の移動の禁止を解除する外筒4と、外筒4が回転した際、その回転力が穿刺針7に伝達されるのを防止する回転力伝達防止機構10とを有している。【選択図】図6
