The invention relates to an auto-injector (1) for administering a dose of a liquid medicament (M), comprising: - an elongate housing (2) arranged to contain a syringe, the housing (2) having a distal end (D) and a proximal end (P) with an orifice, wherein the syringe (3) is slidably arranged with respect to the housing (2), - a drive spring (8) capable of, upon activation: - pushing the needle (4) from a covered position inside the housing (2) into an advanced position through the orifice and past the proximal end (P), and - operating the syringe (3) to supply the dose of medicament (M), and - activating means (16) arranged to lock the drive spring (8) in a compressed state and capable of releasing the drive spring (8) for injection, wherein the elongate housing (2) comprises a distal portion (2.1) and a proximal portion (2.2) connected by a hinge (10), the portions (2.1, 2.2) rotatable about the hinge (10) between an aligned position and a maximum opening angle, wherein the drive spring (8) may be compressed by rotating the portions (2.1, 2.2) towards the maximum opening angle, wherein the activating means (16) are arranged to lock the drive spring (8) in the compressed state when the portions (2.1, 2.2) are rotated at least almost to the maximum opening angle and wherein a loading bay (7) for holding the syringe (3) is arranged in the proximal portion (2.2).
