The present invention relates in one aspect to a housing for an injection device, comprising:- a body (30) to accommodate a drive mechanism (5) to operably engage with a piston (52) of a cartridge (50) filled with a liquid injectable medicament (53),- a cartridge holder (20) having a cartridge receiving space (25) to accommodate the cartridge (50),- wherein the cartridge holder (20) and the body (30) comprise an elongated shape and extend along an axial longitudinal direction (1, 2),- wherein the cartridge holder (20) has an insert section (21) at a proximal end (23),- wherein the body (30) has a receptacle (31) at a distal end (33) to receive the insert section (21) of the cartridge holder (20),- wherein the body (30) comprises a first latch element (34) on an inside (32) of a sidewall (32) of the receptacle (31),- wherein the cartridge holder (20) comprises a first through recess (24) in a sidewall (22) of the insert section (21) which through recess (24) is configured to receive the first latch element (34), wherein the through recess (24) comprises a narrowed neck receiving portion (24a) extending axially into a widened latch receiving portion (24b), wherein a first lateral width (w1) of the neck receiving portion (24a) is smaller than a second lateral width (w2) of the latch receiving portion (24b).
