The disclosure relates to an injection device for setting and injecting of a dose of a medicament, the injection device comprising: - an elongated housing (10) extending along a longitudinal axis (z), - a piston rod (20) to operably engage with a piston (7) of a cartridge (6) filled with the medicament, - a clutch (50) comprising a hollow interior (59) and configured to be rotated in a first direction (4) relative to the housing (10) during setting of a dose and to be rotated in a second direction (5) relative to the housing (10) during delivery of the dose, wherein the second direction (5) is opposite to the first direction (4), - a driver (30) configured to follow a rotational movement of the clutch (50) in the second direction (5) during delivery of the dose, and wherein the piston rod (20) is operably engaged with the driver (30) and is configured to be displaced along the longitudinal axis (z) relative to the housing (10) when the driver (30) rotates in the second direction (5), - a retainer (86) configured to prevent a rotational movement of the driver (30) relative to the housing (10) in the first direction (4) during setting of the dose, - wherein the driver (30) comprises a driver sleeve section (31) and wherein at least a portion of the driver sleeve section (31) is arranged inside the hollow interior (59) of the clutch (50).L'invention concerne un dispositif d'injection pour le réglage et l'injection d'une dose d'un médicament, le dispositif d'injection comprenant : - un boîtier (10) allongé s'étendant le long d'un axe longitudinal (z), - une tige de piston (20) destinée à venir en prise fonctionnelle avec un piston (7) d'une cartouche (6) remplie du médicament, - un embrayage (50) comprenant un intérieur creux (59) et configuré pour être tourné dans une première direction (4) par rapport au boîtier (10) pendant le réglage d'une dose et pour être tourné dans une seconde direction (5) par rapport au boîtier (10) pendant l'administration de la dose, la seco
