The invention relates to an injection device with a luer fitting (250). The injection device has a compressible syringe body defining a reservoir. A male luer fitting (250) has a channe. A first connecting structure is arranged on said male luer fitting between said base end and said luer tip. A shield cap (260) is arranged on the male luer fitting (250) and has a second connecting structure interacting with said first connecting structure to prevent inadvertent movement of said shield cap relative to said male luer fitting when said shield cap is arranged at said first position. A first seal (270) is provided for sealing said channel at said luer tip and preventing leakage therethrough of content from said reservoir at least when the shield cap is at said first position. A second seal (280) is arranged between said shield cap and said male luer fitting for sealing the outer surface and the luer tip of said male luer fitting from outside contamination. The second seal (280) is formed by said first and second connecting structures when the shield cap is arranged at the first position. The shield cap is movable relative to said male luer fitting to a second position from said first position to break the first seal.
