A protective cover (4) to be used with disposable injection needles (1), such as those used for injection of insulin, which injection needles comprise a base (3) and a needle (2) fastened in the base, said protective cover comprising a hood (9) pivotably fastened on the base, said hood (9) being arranged to be pivotable, with the one and the same hand that holds a syringe on which the injection needle is arranged, between an inactive position at the side of the needle (2) of the injection needle and an active position in front of the needle (2) seen in the longitudinal direction of the needle.