A disposable injector comprising a needle base (1), a syringe (2), and a core rod (4, 41, and 42), also comprising a support element (3). The support element (3) is fixed on the syringe (2), allowing the needle base (1) to be fixed relative to the syringe (2). The support element (3) and the core rod (4, 41, and 42) are configured such that when the core rod (4, 41, and 42) is pulled back, the core rod (4, 41, and 42) acts on the support element (3) and allows the support element (3) to be detached from the syringe (1).
