A medicament delivery device has a housing for a medicament container； a dose setting member rotatable in relation to the housing； a plunger rod acting on a stopper inside the medicament container； a driver that converts rotation of the dose setting member into translation of the plunger rod； a transversal clock spring connected to the dose setting member and to a drive member connected to the plunger rod, such that rotating the dose setting member tensions the spring； a spring hold and release member releasably connected to the drive member； and an activator having a distal end protruding through a distal passage of the dose setting member and connected to the hold and release member. Pushing the activator proximally moves the hold and release member proximally, releasing the spring from its tensioned state and forcing the drive member to rotate.
