According to the invention, a safety device (1) for a pre-filled syringe (2) comprises a needle shield (1.1) adapted to cover an injection needle (2.1) of the pre-filled syringe (2) before and after an injection, a support body (1.2) with at least one pivoting arm (1.2.2) adapted to engage a barrel collar (2.2.1) of the pre-filled syringe (2) and an outer body (1.3) with a first inner sleeve (1.3.5) comprising a bevelled section (1.3.7). The needle shield (1.1), the support body (1.2) and the outer body(1.3) are telescopically arranged. The needle shield (1.1), the support body (1.2) and the outer body (1.3) may telescope with respect to each other to cover and to expose the injection needle (2.1) of the pre-filled syringe (2).The bevelled section (1.3.7) is arranged to abut against the pivoting arm (1.2.2) connected to the support body (1.2) by a living hinge (1.2.3) to deflect the pivoting arm (1.2.2) radially inwards, so that the pivoting arm may engage the barrel collar after a dose of a medicament contained in the pre-filled syringe has been disposed beneath the skin of a patient receiving the injection.
