The present invention relates to an automatic injection device (1) comprising : a container aligned on a longitudinal axis A and movable between a first position and a second position in which the needle is inserted biasing means laterally spaced with respect to said longitudinal axis A and coupled to the container for moving it to its second position via linking means retaining means (70) for maintaining said biasing means in a first stressed state deactivating means (80) capable of moving along a transversal direction for releasing said retaining means triggering means (90) for releasing said deactivating means.
