An injection device comprising a body for receiving a syringe, a firing mechanism comprising a plunger configured to be axially displaced in a forward direction within the body and a driver system for driving the plunger forwards upon activation of the injection device, and a lockout shroud telescopically coupled to a forward end of the body so that it projects from the forward end at least immediately prior to activation in order to shroud a syringe needle. The device further comprises a biasing member for biasing the lockout shroud in a forward direction relative to the body, the lockout shroud being coupled to the firing mechanism such that a first predefined rearward movement of the shroud relative to the body releases the driver system to drive the plunger forward, and a lockout shroud inhibitor configured to provide increased resistance to rearward movement of the lockout shroud following a second predefined rearward movement of the lockout shroud, less than said first predefined rearward movement.本發明揭露了一種注射裝置，包含：主體，用於容納注射器；發射機構，包含柱塞及驅動系統，其中此柱塞係於此主體內在前向方向中進行軸向位移，此驅動系統係用於在啟動此注射裝置時向前驅動此柱塞；鎖定罩，可伸縮地與此主體之前端相耦合，此鎖定罩至少在啟用前至少立即從此前端突出，藉以覆蓋注射器針頭；偏置構件，用於在前向方向中使此鎖定罩相對於此主體產生偏移，其中此鎖定罩與此發射機構相耦合，藉以透過此鎖定罩相對於此主體所產生之第一預定向後運動鬆開此驅動系統，進而向前驅動此柱塞；以及鎖定罩止動器，用於在此鎖定罩之第二預定向後運動後對此鎖定罩之向後運動施加增大的阻力，其中此第二預定向後運動小於此第一預定向後運動。
