Disclosed are a syringe needle assembly, and a safety syringe and a safety syringe device which use the syringe needle assembly. The syringe needle assembly includes a syringe needle having a needle tip formed on a front end thereof, and a safety tube covering the syringe needle, coupled to a rear end of the syringe needle and opened in an injection direction of the syringe needle. When the syringe needle is inserted into skin, the safety tube is contracted towards a rear side of the needle tip, and when the syringe needle is pulled out from the skin, the safety tube is extended towards a front side of the needle tip.一種注射器針頭組件以及使用所述注射器針頭組件之一種安全注射器與一種之安全注射器裝置。所述注射器針頭組件包括:一於其前端形成有針頭尖端之注射器針頭以及一覆蓋該注射器針頭之安全管,該安全管係連接至該注射器針頭之後端,且於該注射器針頭的注射方向具有開口。當該注射器針頭插入皮膚時,該安全管將縮回至該針頭尖端之後側,而當將該注射器針頭自前述皮膚拔出時,該安全管將延伸至該針頭尖端之前側。10‧‧‧安全注射器100‧‧‧注射器針頭組件200‧‧‧注射筒300‧‧‧柱塞110‧‧‧注射器針頭111‧‧‧針頭尖端113‧‧‧連接部130‧‧‧安全管
