The present invention relates to an automatic injection device (1) comprising : a container having a longitudinal axis A and movable between a first position and a second position in which the needle is inserted biasing means for moving the container to its second position retaining means (70 73 74) for maintaining said biasing means in a first stressed state triggering means (90) for releasing said retaining means said retaining means comprising a lever member having a pivoting part and a radial projection extending therefrom said radial projection being in a first angular position when said retaining means is in its passive condition said radial projection being in a second angular position different from said first angular position when said retaining means is in its active condition the axis of said pivoting part being included in a transversal plane of said longitudinal axis A.
