The present invention relates to a cartridge holder of an injection device (10), the cartridge holder comprising a tubular shaped elongated sleeve (29) extending in an axial direction (1, 2) to accommodate a cartridge (50) filled with a medicament, wherein the sleeve (29) comprises: - a proximal connecting end (21) to connect with a distal connecting end (31) of a body (30) of the injection device (10), which body (30) is configured to accommodate a drive mechanism (5) of the injection device (5) and which drive mechanism (5) is operably engageable with a piston (52) of the cartridge (50), - a flange section (23) extending radially outwardly from an outside surface (27) of the sleeve (29； 229) and having a proximally facing abutment face (24) to axially abut with a distal end face (34) of the distal connecting end (31) of the body (30), - at least three protrusions (120, 130) located distally from the flange section (23), extending radially outwardly from the outside surface (27) of the sleeve (29； 229) and being distributed around the circumference of the sleeve (29； 229).
