A safety device for a medicament delivery device

A safety device for a medicament delivery device, the safety device comprising:

• a housing extending in a longitudinal direction from a proximal end (3a) to a distal end relative a longitudinal axis;
• a cover structure configured to surround a medicament delivery member at the proximal end of the housing, the cover structure is axially movable in relation to the housing along the longitudinal axis between a retracted position in which the medicament delivery member is exposed at the proximal end of the cover structure, and an extended position with the medicament delivery member covered by the cover structure;
• a carrier immovably arranged within the housing configured to hold the medicament delivery member, the carrier comprises a stop surface facing the proximal end of the housing;
• and
• a lock member arranged coaxially inside the cover structure within the housing, wherein the lock member comprises a distally facing surface, and an engagement element comprising a proximally facing surface, wherein a motion of the cover structure in a proximal direction towards the extended position after a medicament delivery operation causes a transition from an initial position where the proximally facing surface of the engagement element is spaced apart from a distally facing surface of the cover structure to a locked position where the proximally facing surface of the engagement element abuts the distally facing surface of the cover structure, wherein, in the locked position, a distal motion of the lock member along the longitudinal axis of the housing is blocked by the stop surface of the carrier abutting the distally facing surface of the lock member.