An injection device comprises an injector body arranged for mounting a syringe with a needle shield and a cap disposed at one end of the injector body. The cap comprises a main body with a first open end and a second closed end, the main body comprising one or more openings through an outer surface and an engaging member disposed externally on the main body, which comprises one or more protruding elements arranged to extend inwards through the one or more corresponding openings in the outer surface of the main body and configured to engage with the needle shield.一種注射裝置包括:注射器主體,其佈置成用於安裝具有針護罩的注射筒;以及設置在所述注射器主體一端處的蓋。蓋包括具有第一敞開端和第二封閉端的主體,主體包括穿過外表面的一或多個開口;以及接合構件,接合構件從外面設置在主體上,所述接合構件包括一或多個突出元件,所述一或多個突出元件佈置成穿過主體外表面中相應的所述一或多個開口向內延伸並且被構造成與針護罩接合。20‧‧‧蓋100‧‧‧接合構件110‧‧‧環120‧‧‧刺200‧‧‧主體210‧‧‧第一部分211‧‧‧凹槽部212‧‧‧開口220‧‧‧第二部分221‧‧‧邊沿
