The present invention relates to a drug delivery device comprising a generally elongated housing (10, 24) having a proximal end and a distal end, provided on the drug delivery member (20) upon activation, said housing A drug delivery activation mechanism (16) capable of delivering a dose of drug from a drug container (18) disposed in the drug delivery member shield (22) provided on the drug delivery member (20)； A drug delivery member guard (54) movably disposed at the proximal end of the housing (10, 24), the drug delivery member guard (54) comprising the drug delivery activation mechanism (16) And the drug delivery device further comprises a protective cap (42) releasably disposed at the proximal end of the housing, the protective cap (42) Drug delivery member shield removal (50) That, on the drug delivery device. The invention features a blocking element (58) provided on the drug delivery member guard (54), the blocking element (58) being provided movable between a blocking position and a release position, the blocking element (58) is provided with an engagement surface (62) provided to engage with the proximal region (68) of the housing, the blocking element (58) 50) in engagement with the surface of said 50 and holding said blocking element in said blocking position, engagement of said engagement surface (62) with said proximal region (68) In order to prevent movement of (54), removal of the protective cap (42) and the drug delivery member shield removal portion (50) causes the engagement surface (62) to engage the proximal region (68) When the blocking element (58) is moved to the release position The possible to the drug delivery member guard (54) is to be moved.本発明は、薬剤送達装置であって、近位端部および遠位端部を有する概ね細長い筐体（１０，２４）と、活性化の際、薬剤送達部材（２０）に設けられ前記筐体に配置される薬剤容器（１８）から用量の薬剤を送達することが可能な薬剤送達活性化機構（１６）と、前記薬剤送達部材（２０）に設けられる薬剤送達部材シールド（２２）と、前記筐体（１０，２４）の前記近位端部に移動可能に配置される薬剤送達部材ガード（５４）と、を備え、前記薬剤送達部材ガード（５４）は、前記薬剤送達活性化機構（１６）に動作可能に接続されており、前記薬剤送達装置はさらに、前記筐体の前記近位端部に解放可能に配置される保護キャップ（４２）を備え、前記保護キャ
