a medicament delivery device includes a housing with a compartment for a medicament container , an injection needle arranged to housing and connectable to the medicament container for delivering a dose of medicament , a manually operated activation mechanism , an actuation mechanism operably connected to the activation mechanism and configured to extend the injection needle , upon activation of the activation mechanism , from a first position inside the housing to a second position for penetrating a patient , a plunger rod in the housing configured to act on the medicament container for delivering a dose of medicament through the injection needle , a driver configured to acting on the plunger rod for delivering the dose , and a needle cover operably arranged in the housing between a position inside the housing and an extended position outside the housing for shielding the injection needle when the injection needle is in the second position .