The present invention relates to a medicament delivery device comprising a housing, which housing is arranged to accommodate a medicament container, a drive unit operably arranged to act on said medicament container for expelling a dose of medicament, the drive unit comprising a plunger rod, a force element operably connected to said plunger rod, a connector arranged to releasibly hold said plunger rod, an actuator element operably arranged to said connector and a manually operable actuator arranged to act on said actuator element for releasing said connector when operated. The invention is characterised in a safety device arranged to releasibly hold said actuator element in a locking position with said connector, preventing unintended release of said plunger rod.
