The present invention relates to a medicament delivery device it is characterised by medicament delivery device comprising a generally tubular housing having opposite proximal and distal ends, wherein the housing is provided with a coaxial tubular sleeve extending from its distal end towards the proximal enda generally tubular medicament delivery member shield coaxially and slidably arranged within the housing, wherein a proximal portion of the tubular medicament delivery member shield protrudes from the proximal end of the housing a medicament container provided with a medicament delivery member, a chamber containing a medicament, and an axial movable piston drive means comprising a plunger rod having opposite proximal and distal ends, and a force spring means, wherein the proximal end of the plunger rod is in contact with the pistonwherein the device further comprises a medicament container holder coaxially arranged to the drive means and capable of supporting the medicament container wherein the medicament container holder comprises a first locking means releasibly connected to corresponding locking means on the coaxial tubular sleeve forming a first locking engagement for holding the medicament container holder in an initial state against a force from the drive means, wherein the medicament delivery member shield is capable of releasing said first locking engagement when the medicament delivery member shield is pressed against a medicament delivery site, whereby said drive means forces said medicament container holder a certain predetermined distance towards the proximal end of the device and a second locking means surrounded by the coaxial tubular sleeve and releasibly connected to corresponding locking means on the plunger rod forming a second locking engagement for preventing the piston to be affected by the force from the drive means until said medicament container holder has moved the certain predetermined distance.La présente invention concerne un disposit
