The puncture tool includes a puncture needle having a sharp needle point at its distal end, a puncture needle for puncturing a blood vessel, and a restriction member which is provided to be connected to the puncture needle and which can take a restricted state for regulating the position of the blood vessel. The puncture tool further includes a forward moving mechanism for allowing the puncture needle to move forward with respect to the regulating member toward the blood vessel in a restricted state when puncturing the blood vessel with the puncture needle. Further, the regulating member includes two elongated members which are juxtaposed apart from each other and have abutting surfaces abutting the living body surface in a restricted state at the distal end portion.穿刺具は、先端に鋭利な針先を有し、血管を穿刺する穿刺針と、穿刺針に接続して設けられ、血管の位置を規制する規制状態を取り得る規制部材とを備えている。そして、この穿刺具は、穿刺針によって血管を穿刺する際に、規制状態のまま血管に向かって穿刺針を規制部材に対して前進可能にするための前進可動機構をさらに備えている。また、規制部材は、互いに離間して並設され、先端部に規制状態で生体表面に当接する当接面を有する2本の長尺体を備えている。
