PROBLEM TO BE SOLVED: To provide a needle set capable of reducing a risk of damaging a body inner wall even when a needle for use in centesis is not removed after the centesis.SOLUTION: A needle set includes: a needle member having a hollow part inside； a tube member that can be inserted in the hollow part and moved in the hollow part in an axial direction of the needle member； and an expansion member that, when a distal end of the tube member is projected from a distal end of the needle member, expands an opening at the distal end of the tube member.SELECTED DRAWING: Figure 2【課題】穿刺後、穿刺に使用した針を抜かない場合であっても体内の内壁を損傷するリスクを低減することができる針セットを提供することを目的とする。【解決手段】内部に中空部を区画する針部材と、前記中空部内に挿入可能であって、該中空部内を該針部材の軸方向に移動可能な管部材と、該管部材の先端部が前記針部材の先端部より突出する際、前記管部材の先端の開口を拡張させる拡張部材と、を備える。【選択図】図２
