Auto-injector for administering a dose of a liquid medicament, comprising: - an elongate housing arranged to contain a syringe with a hollow needle and a stopper for sealing the syringe and displacing the medicament, the housing having a distal end and a proximal end with an orifice intended to be applied against an injection site, wherein the syringe is slidably arranged with respect to the housing, - spring means capable of, upon activation: - pushing the needle from a covered position inside the housing into an advanced position through the orifice and past the proximal end, - operating the syringe to supply the dose of medicament, and - retracting the syringe with the needle into the covered position after delivering the medicament, - activating means arranged to lock the spring means in a pressurized state prior to manual operation and capable of, upon manual operation, releasing the spring means for injection, wherein the spring means is a single drive spring in the shape of a compression spring arranged to be grounded at a distal end in the housing for advancing the needle and for injecting the dose of medicament via a plunger and wherein the drive spring is arranged to have its ground in the housing switched to its proximal end for retracting the syringe, wherein an interlock sleeve is telescoped in the proximal end of the housing, the interlock sleeve translatable in longitudinal direction between a proximal position and a distal position and biased in proximal direction in a manner to protrude from the housing in the proximal position, characterized in that in an as delivered state of the auto-injector, in its proximal position the interlock sleeve is arranged to be coupled to the syringe in the syringe's retracted position for joint axial movement and wherein the interlock sleeve in its distal position is arranged to allow decoupling of the syringe, wherein a tubular syringe carrier is arranged for holding the syringe and supporting it at its proximal end, the syringe and the syringe carrier arranged for joint axial translation, wherein the syringe carrier is telescoped in the interlock sleeve, wherein at least one resilient second latch is arranged in the housing near the proximal end, wherein in the as delivered state the resilient second latch extends inwards through respective apertures (25.1) in a manner to prevent the syringe carrier from translating in proximal direction by the syringe carrier abutting respective distal faces (27.1) of the second latches so that the syringe carrier, the syringe and the needle cannot be forwarded when pushed by the plunger, wherein the resilient second latch is arranged to be disengaged from the syringe carrier upon translation of the interlock sleeve in distal direction. - an elongate housing arranged to contain a syringe with a hollow needle and a stopper for sealing the syringe and displacing the medicament, the housing having a distal end and a proximal end with an orifice intended to be applied against an injection site, wherein the syringe is slidably arranged with respect to the housing, - spring means capable of, upon activation: - pushing the needle from a covered position inside the housing into an advanced position through the orifice and past the proximal end, - operating the syringe to supply the dose of medicament, and - retracting the syringe with the needle into the covered position after delivering the medicament, - pushing the needle from a covered position inside the housing into an advanced position through the orifice and past the proximal end, - operating the syringe to supply the dose of medicament, and - retracting the syringe with the needle into the covered position after delivering the medicament, - activating means arranged to lock the spring means in a pressurized state prior to manual operation and capable of, upon manual operation, releasing the spring means for injection,