The present invention relates to a medicament delivery device (10) comprising a housing (12, 14); a medicament container (22) arranged inside the housing; a medicament delivery drive unit comprising a plunger rod (28) acting on said medicament container (22) and a power force (26) capable of driving said plunger rod (28) for delivering a dose of medicament. The invention is characterised in a delivery controller (30) comprising a manually operable release mechanism (30, 36) for releasing said plunger rod (28) and said power source (26) for delivering a dose of medicament and a manually operable control speed mechanism (30, 38) capable of controlling the speed of the released plunger rod and thereby the medicament delivery speed.