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.
