The invention provides a drug delivery device for dispensing of a dose of a medicinal product, comprising: a housing (12, 20；120) having a proximal end and a distal end, a container (16) comprising the medicinal product, a piston being retained in the container (16), a push-pull element (50； 150), wherein the push-pull element (50；150) is displaceable in proximal direction for setting of a dose and wherein the push-pull element (50； 150) is displaceable in distal direction for dispensing of a dose, a piston rod (40；140) being coupled with the housing (12, 20；120) and having a distal end (42) to interact with the container's piston (18), the piston rod (40；140) being further coupled with the push-pull element (50；150), coupling elements for converting a proximal displacement of the push-pull element (50；150) into a rotational movement of the piston rod (40； 140) and for converting a distal displacement of the push-pull element (50；150) into an axial movement of the piston rod (40) with respect to the housing (12, 20； 120).
