The present invention discloses a needle device, comprising: a needle base； a needle head； a first structure part, the first structure part is arranged outside the needle base and slip matches with the needle base along extension direction of the needle head, a first limit mechanism is arranged, and is adapted to prevent the first structure part being separated from the needle base along extension direction of the needle head； a second structure part, the second structure part is arranged outside the first structure part and slip matches with the first structure part along extension direction of the needle head； a second limit mechanism is arranged and is adapted to prevent the second structure part being separated from the first structure part along extension direction of the needle head； the first structure part and the second structure part are adapted to slide along the extension direction of the needle hand for holding the needle head into the second structure part. It has advantages that the operator operates conveniently when using, and the skin of patients is comfortable, the needle head can be covered quickly by the structure parts above the needle base after use, and the connection between the structure parts and needle base is tight, the structure parts will not fall off, security of products is improved effectively.本發明揭露一種針刺裝置，其包括：針座；針頭；第一結構件，設置在針座的外部且與針座沿針頭延伸方向滑動配合，設有第一限位機構，適於限制第一結構件沿著針頭的延伸方向與針座分離；第二結構件，設置在第一結構件的外部且與第一結構件沿針頭的延伸方向滑動配合；設有第二限位機構，適於限制第二結構件沿著針頭的延伸方向與第一結構件分離；第一結構件和第二結構件適於通過沿針頭延伸方向滑動以將針頭收納入第二結構件內。具有使用時操作者操作方便、患者皮膚舒適的優點，使用後可以快速地使針座上方的結構件將針頭蓋住，而且結構件及針座之間連接牢固，不會發生結構件脫落情況，有效地提高產品的安全性。
