An injection device having a distal end, and including a needle located inside the injection device in an initial position, wherein the needle is moveable to a puncturing position in which the needle projects from the distal end, an open region located distally relative to the needle in the initial position of the needle and having a dimension, a reduction piece moveable relative to the opening region whereby the dimension may be reduced and a holding member that latchingly connects to the reduction piece and a product container holder.
