The present invention relates to a medicament delivery device comprising, a housing (10, 114) having a proximal and a distal end, a delivery member connected to the housing; a medicament container (84) operably arranged within the housing; a drive mechanism (102, 108) capable of acting on the medicament container (84) for priming and for expelling a dose of medicament. The invention is characterised in that the device further comprises - an activator mechanism configured to interact with the drive mechanism, such that a first interaction between the activator mechanism and the drive mechanism causes the container to move towards the delivery member wherein the container is primed and such that a subsequent second interaction between the activator mechanism and the drive mechanism causes a dose of medicament to be expelled through the delivery member. (FIG. 3)