The present invention comprises a container (2) having a longitudinal axis A and movable between a first position and a second position into which the needle is inserted, and an attachment for moving the container to its second position. The holding means includes a biasing means (8), a holding means (70, 74, 74b) for maintaining the biasing means in the first tensioned state, and an activation means (90, 91e) for releasing the holding means. Comprises a lever member having a rotatable cylindrical portion and a radial protrusion extending therefrom, the radial protrusion being in a first angular position when the retaining means is in its passive state and radially protruding. The automatic injection device in which the part is in a second angular position different from the first angular position when the holding means is in its active state, and the rotatable cylindrical part is contained in the cross section of the longitudinal axis A Regarding (1).本発明は、長手方向軸Ａを有すると共に第１の位置と針が挿入される第２の位置との間で移動可能である容器（２）と、容器をその第２の位置に移動させる付勢手段（８）と、付勢手段を第１の緊張された状態に維持する保持手段（７０、７４、７４ｂ）と、保持手段を解除する起動手段（９０、９１ｅ）とを備え、保持手段は、回転可能な円筒部分とそこから延びる半径方向突出部とを有するレバー部材を備え、半径方向突出部は、保持手段がその受動状態にあるときに第１の角度位置にあり、半径方向突出部は、保持手段がその能動状態にあるときに第１の角度位置とは異なる第２の角度位置にあり、回転可能な円筒部分は、長手方向軸Ａの横断面内に含まれる自動注射装置（１）に関する。
