This invention provides a safety syringe device, which comprises a barrel and the front end of the barrel is configured with a barrel connector a needle device including a needle base, in which the needle base is fitted onto the barrel connector and the front end of the needle base is configured with a needle an elastic action host portion, which comprises a fixed U-shaped portion, a movable U-shaped portion, a soft hinge, a V-shaped elastomer, and a fitting member, wherein two U-shaped portions are connected by the soft hinge the V-shaped elastomer connected with both ends of the opening may provide sufficient elastic force for bending operation of the two U-shaped portions the fixed U-shaped portion is connected with the fitting member as a whole and, the elastic action host portion is fitted onto the needle base with by the fitting member and, a protective sleeve having a fitting space, and the front end of the protective sleeve is configured with an insertion portion, wherein the insertion portion is assembled with a receiving portion which is upwardly extended from the end of the moveable U-shaped portion to connect the movable U-shaped portion with the protective sleeve.本發明是一種安全注射針裝置,包括針筒,該針筒前端設有一針筒接頭;一針頭裝置,包括一針頭座,該針頭座套接於該針筒接頭,該針頭座前端設有一針頭;一彈性作動主體部,包括有一固定U形部、一活動U形部、一軟質絞鏈部、一V形彈性體及一套件,兩U形部之間是以軟質絞鏈部連接;並藉通口處兩端所連接的V形彈性體,於該兩U形部進行彎折操作時提供充分足夠的彈性作用力,該固定U形部一體連結於該套件,而該彈性作動主體部以該套件套接於針頭座上;一保護套,該保護套具有一套置空間,該保護套的前端邊設有一插接部,該插接部組接於該活動U形部末端向上延伸的受插部,使該活動U形部與保護套相連結。10‧‧‧注射針裝置11‧‧‧針筒12‧‧‧針筒接頭13‧‧‧活塞推桿20‧‧‧針頭裝置21‧‧‧針頭座211‧‧‧導塊22‧‧‧針頭支撐套23‧‧‧針頭30‧‧‧彈性作動主體部31‧‧‧固定U形部32‧‧‧活動U形部33‧‧‧薄膜軟質絞鏈部330‧‧‧通口34‧‧‧受插部35‧‧‧V形彈性體38‧‧‧套件381‧‧‧前凹槽40‧‧‧保護套41‧‧‧基板42‧‧‧側板421‧‧‧護條422‧‧‧撥動部43‧‧‧端板44‧‧‧套置空間45‧‧‧插接部
