Auto-injector (1) for delivering a liquid medicament (M), the auto-injector (1) comprising an elongate housing (2) having a loading bay (12) configured to receive a packaged syringe (4), wherein the loading bay (12) is configured to be laterally accessible for inserting or removing the packaged syringe (4), wherein a sliding door (3) is slidably arranged over the housing (2) in a manner to reveal the loading bay (12) in a distal position and to cover the loading bay (12) in a proximal position.