The present disclosure relates to a medicament delivery training device comprising a body, a needle cover, a rotator that is torsionally biased, and a plunger rod. When the needle cover is moved from an extended position to a retracted position relative to the body, this linear motion is transformed into a rotational motion of the rotator which thereby releases the plunger rod. The plunger rod, which is biased, is thereby able to move axially. During axial motion of the plunger rod, the plunger rod is arranged to engage with the rotator to thereby displace the rotator axially, eventually resulting in a first angular distance rotation of the rotator. Upon release of the biased needle cover from the extended position, the rotator is allowed to rotate a second angular distance, thus obtaining a position which prevents the needle cover to move from the extended position towards the retracted position.
