As for this invention, the stab needle at the same time in the specified region of the skin simplicity securely the stab instrument which the stab can do is offered. The stab instrument of this invention, has with the stab needle retention component and the skin deformation component and the engagement cancellation component and the elastic member which keep the stab needle. The skin deformation component has with the engagement section where the stab needle retention component is engaged and this contact surface which this touches to the skin, forms the difference in level part on the skin by the pushing overpowering the skin with this contact surface. The engagement cancellation component removes the engagement of the engagement section of the stab needle retention component and the skin deformation component. The elastic member makes the stab needle retention component where engagement of the engagement section comes off this contact surface and abbreviation parallel direction discharge, the stab does the stab needle in the difference in level part of the skin which was formed by the skin deformation component.本発明は、穿刺針を皮膚の所定の部位に簡単且つ確実に穿刺することができる穿刺器具を提供する。本発明の穿刺器具は、穿刺針を保持する穿刺針保持部材と、皮膚変形部材と、係合解除部材と、弾性部材とを備える。皮膚変形部材は、穿刺針保持部材が係合される係合部と皮膚に当接する当接面とを有し、当接面で皮膚を押圧することにより皮膚に段差部分を形成する。係合解除部材は、穿刺針保持部材と皮膚変形部材の係合部との係合を外す。弾性部材は、係合部との係合が外れた穿刺針保持部材を当接面と略平行な方向に発射させ、皮膚変形部材によって形成された皮膚の段差部分に穿刺針を穿刺する。
