The present invention relates to a medicament delivery device comprising: a housing; a drive mechanism arranged to act on a plunger rod; a release mechanism interactively connected to the drive mechanism for releasing the drive mechanism from a pre-tensioned state; and a signal generating mechanism for generating an audible and/or tactile and/or visual signal indicating that a medicament has been completely delivered. The signal generating mechanism is operably connected to said drive mechanism such that it is arranged movable in a longitudinal direction in relation to said drive mechanism. Said drive mechanism is arranged with a signal release mechanism capable of activating said signal generating mechanism at a certain longitudinal position of said drive mechanism after its release, for generating an audible and/or tactile and/or visual signal. Said signal generating mechanism comprises a signal delay mechanism.