Injection device (1), in particular auto-injector, which is configured so that it can be moved from a storage position to an injection position, with a support housing (2) having a distal end (11), which can be directed to a patient (10), and a proximal end (12) away from it, between which extends a longitudinal axis (13), an activation sheath (9) that at least partially surrounds the support housing (2), overcoming the extremodistal (11) of the support housing (2) in height to the activation sheath (9) and the support housing (2) being surrounded by most of its longitudinal extension between the distal and proximal ends (11, 12 ) through the deactivation sheath (9), the activation sheath (9) being able to move relative to the support housing (2) in axial direction, a cartridge (3) with a medicament (14) contained therein and leaving to be administered in the injection operation, being e l cartridge (3) housed in the support housing (2), a first drive unit (4) that is in active connection with the cartridge (3) as well as with the deactivation sheath (9) and that can be fired by means of the activation sheath (9), a safety device (5) that secures the first drive unit (4) in position with respect to support loosening (2) until activation by means of the activation sheath (9) for the operation of injection, a needle assembly (6) that is disposed in front of the cartridge (3) in the storage position of the injection device (1) in the section of the distal end (11) and both needle ends being arranged (21,22 ) of a cannula (20) inside the support housing (2), a needle protection element (7) that can be moved from an ineffective position to a position that covers the needle end (21) protruding from the distal end (11) of the support housing (2) after the operation injection ion, a second drive unit (8) that can be triggered, which moves the needle protection element (7) from the non-effective position to the coating position, characterized in that the needle protection el
