The present invention relates to a medicament delivery device, comprising a housing (10) having a proximal end (11) and a distal end (12) a hollow piston plunger (20) being arranged within the housing (10) a telescopic dose drum (40) being concentrically arranged between the housing (10) and the piston plunger (20), piston plunger driving means for driving the hollow piston plunger towards the proximal end, comprising a hollow drive drum sleeve (30) being movable arranged within the hollow piston plunger (20) and being fixedly connected to the telescopic dose drum (40), wherein the hollow drive drum sleeve (30) and the hollow piston plunger (20) are coupleable to each other actuation means operably connected to said hollow drive drum sleeve, wherein the hollow drive drum sleeve (30) and the hollow piston plunger (20) are operationally coupled such that axial movement of the actuation means towards the proximal end forces the hollow drive drum sleeve (30) and the hollow piston plunger (20) to couple together whereby the hollow piston plunger (20) and the telescopic dose drum (40) are displaced towards the proximal end for delivering the set dose. The invention is characterized in that the device further comprises a stop body (26) for inhibiting rotation of the telescopic dose drum (40) and the drive drum sleeve (30) when the set dose equals the remaining dose in the medicament container.La présente invention concerne un dispositif dadministration de médicament, comprenant un boîtier (10) ayant une extrémité proximale (11) et une extrémité distale (12) un piston plongeur creux (20) disposé à lintérieur du boîtier (10) un tambour de dosage télescopique (40) disposé de façon concentrique entre le boîtier (10) et le piston plongeur (20), des moyens dentraînement de piston plongeur pour entraîner le piston plongeur creux vers lextrémité proximale, comprenant un manchon de tambour dentraînement creux (30) monté mobile à lintérieur du piston plongeur creux (20) et relié de
