The present disclosure relates to a cartridge holder of an injection device, the cartridge holder comprising a tubular shaped elongated sleeve extending in an axial direction to accommodate a cartridge filled with a medicament, wherein the sleeve (29) comprises:a proximal connecting end to connect with a distal connecting end of a body of the injection device, which body is configured to accommodate a drive mechanism of the injection device and which drive mechanism is operably engageable with a piston of the cartridge,a flange section extending radially outwardly from an outside surface of the sleeve and having a proximally facing abutment face to axially abut with a distal end face of the distal connecting end of the body,at least three protrusions located distally from the flange section, extending radially outwardly from the outside surface of the sleeve and being distributed around the circumference of the sleeve.
