A syringe (1), which is used for providing a barrel assembly (40) assembled therein to constitute an injection device. The syringe (1) comprises a housing shell (10), a needle cover (20) and an elastic protecting member (30), the needle cover (20) is detachably connected to a front end of the housing shell (10), and the elastic protecting member (30) is mounted inside the housing shell (10) and extends into the needle cover (20). When the barrel assembly (40) is mounted in the syringe (1), a soft stopper (44) sleeved on a needle (43) at a front end of a barrel (41) extends into the needle cover (20), so that the needle cover (20), a sheath body (31) at a front end of the elastic protecting member (30), and the soft stopper (44) together provide safety protection against the needle (43). Before injecting, the needle cover (20) is detached from the front end of the housing shell (10) and the soft stopper (44) is pulled out along therewith by means of an elastic hook portion (23) at a rear end of the needle cover (20), so that the soft stopper (44) sleeved on the needle (43) can be easily removed, the sheath body (31) can be located outside the needle (43) to protect, and the sheath body (31) is able to extend or contract along with the injection action.L'invention concerne une seringue (1) qui est utilisée pour fournir un ensemble cylindre (40) assemblé à l'intérieur de celle-ci afin de constituer un dispositif d'injection. La seringue (1) comprend une coque de boîtier (10), un étui protecteur d'aiguille (20) et un élément de protection élastique (30), l'étui protecteur d'aiguille (20) est relié amovible à une extrémité avant de la coque de boîtier (10), et l'élément de protection élastique (30) est monté à l'intérieur de la coque de boîtier (10) et s'étend dans l'étui protecteur d'aiguille (20). Lorsque l'ensemble cylindre (40) est monté dans la seringue (1), un bouchon souple (44) manchonné sur une aiguille (43) au niveau d'une extrémité avant d'un cylindre (41) s'é
