Automatic injection device

The invention relates to an autoinjector for administration of a product. The autoinjector comprising: DOLLAR A - a housing (1, 2, 3), DOLLAR A - A from the housing (1, 2, 3) is slidably accommodated container (B), from which by advancing a piston (K) product through a needle (N) at an outlet of the container (B) is distributed, and DOLLAR a - a from the housing (1, 2, 3) is slidably accommodated driven member (10) of a drive device, in an auto-injection for insertion of the needle (N), the container (B) the housing (1, 2, 3) with respect to a predetermined forward position, and for dispensing of product the piston (K) within the container (B) advances, DOLLAR a where DOLLAR a - the output member (10) until reaching the front position of the container (B) from the piston (K) is de-coupled and decoupled when it reaches this position from the container (B) and to advance the piston (K) within the container (B) to the piston (K) is coupled.