PUNCTURER

PROBLEM TO BE SOLVED: To provide a puncturer which is simple in a constitution, enables housing of a needle tip after use by a simple operation and has a high safety in disposal treatment or the like. SOLUTION: The puncturer 1 has the needle body 2, a hub 3 which is fixed to the base end of the needle body 2, a projector 4 which can house the needle tip 21 of the needle body 2, a regulating means 5 which regulates the movement of the protector 4 further toward the front end direction when the needle tip 21 of the needle body 2 is housed and a coil spring (energizing member) 6. The regulating means 5 comprises a long-sized first connecting member 51 and second connecting member 52 having flexibility. These members are disposed spirally at the outer peripheral part of the needle body 2 so as to respectively connect the hub 3 and the protector 4 and to be made opposite in winding directions to each other. When the protector 4 houses the needle tip 21 of the needle body 2, the first connecting member 51 and the second connecting member 52 are respectively put into a tense state and are wound around the outer periphery of the needle body 2, by which the needle body 2 is tightened with nearly the equal force.