Auto-injector for administering a dose of a liquid medicament, comprising: - a tubular chassis, - a carrier subassembly comprising a tubular carrier slidably arranged relative to the chassis and partially arranged in the chassis, the carrier containing a syringe with a hollow injection needle, a drive spring and a plunger for forwarding load of the drive spring to a stopper of the syringe, wherein the syringe is locked for joint axial translation with the carrier, - a wrap-over trigger sleeve arranged over the distal end of the auto-injector, the trigger sleeve extending at least almost over the whole length of the auto-injector, - a control spring arranged around the carrier, - first interlock means (20, 22, 23, 24) for coupling a proximal end of the control spring to either the carrier for advancing it for needle insertion or to the chassis for needle retraction depending on the relative axial position of the carrier and the trigger sleeve, - second interlock means (11, 13, 15) arranged for releasing the drive spring for injection when the carrier has at least almost reached an injection depth during needle insertion, - third interlock means (16, 17, 18) arranged for coupling the chassis to the carrier for joint axial translation relative to the trigger sleeve, wherein the third interlock means (16, 17, 18) are arranged to decouple the chassis from the carrier upon translation of the trigger sleeve in proximal direction relative to the chassis thus releasing the control spring for needle insertion, - fourth interlock means (21, 25, 26, 28) arranged for coupling a distal end of the control spring to either the carrier for needle retraction or to the trigger sleeve otherwise. - a tubular chassis, - a carrier subassembly comprising a tubular carrier slidably arranged relative to the chassis and partially arranged in the chassis, the carrier containing a syringe with a hollow injection needle, a drive spring and a plunger for forwarding load of the drive spring to a stopper of the syringe, wherein the syringe is locked for joint axial translation with the carrier, - a wrap-over trigger sleeve arranged over the distal end of the auto-injector, the trigger sleeve extending at least almost over the whole length of the auto-injector, - a control spring arranged around the carrier, - first interlock means (20, 22, 23, 24) for coupling a proximal end of the control spring to either the carrier for advancing it for needle insertion or to the chassis for needle retraction depending on the relative axial position of the carrier and the trigger sleeve, - second interlock means (11, 13, 15) arranged for releasing the drive spring for injection when the carrier has at least almost reached an injection depth during needle insertion, - third interlock means (16, 17, 18) arranged for coupling the chassis to the carrier for joint axial translation relative to the trigger sleeve, wherein the third interlock means (16, 17, 18) are arranged to decouple the chassis from the carrier upon translation of the trigger sleeve in proximal direction relative to the chassis thus releasing the control spring for needle insertion, - fourth interlock means (21, 25, 26, 28) arranged for coupling a distal end of the control spring to either the carrier for needle retraction or to the trigger sleeve otherwise.