PROBLEM TO BE SOLVED: To provide a needle set capable of safely protecting a needle tip of a needle member even when the needle member is disposed outside a tube member and the needle member cannot be removed from the tube member after centesis.SOLUTION: A needle set includes: a needle member having a distal end to be inserted into a living body and forming a hollow part inside a tube member that can be moved in the hollow part in an axial direction of the needle member and a protection member that can be deformed in the axial direction of the needle member between a first state of covering the radially outside around the distal end of the needle member at a position radially outside the needle member, and a second state where the distal end is exposed. The protection member can be changed between a lock state of moving relative to the needle member to lock the needle member, and a non-lock member not locking the needle member.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2017,JPO&INPIT【課題】針部材が管部材の外側に配置され、穿刺後に針部材を管部材から抜き去ることができない場合であっても、針部材の針先を安全に保護できる。【解決手段】先端部が生体内に挿入可能な、内部に中空部を区画する針部材と、前記中空部内を前記針部材の軸方向に移動可能な管部材と、前記針部材の径方向外側の位置で、前記針部材の前記先端部に対して前記径方向外側の周囲を覆う第1の状態と、前記先端部が露出する第2の状態との間で前記針部材の軸方向に収縮変形可能な保護部材と、を備え、該保護部材は、前記針部材に対して相対的に移動することにより、前記針部材を係止する係止状態と、前記針部材を係止しない非係止状態との間を変化可能であることを特徴とする。【選択図】図3
