An injection device comprises a housing, a plunger rod and an injection needle that is movably arranged within the housing. The plunger rod is separated into a first plunger rod part and a second plunger rod part. The injection needle is movable from a first position (I) to a second position (II) by actuating the first plunger rod part The injection needle is retained within the housing in the first position (I) and projects from the housing in the second position (II). The second plunger rod partcouples to the first plunger rod part when the injection needle reaches the second position (II).
