A medicament delivery training device comprising: a housing, and an administration mechanism, wherein the housing is configured to receive the administration mechanism, wherein the administration mechanism comprises: - a longitudinal medicament delivery member cover which is biased in a proximal direction by a resilient member, and wherein the medicament delivery member cover is configured to be rotationally locked relative to the housing, characterized in that the device further comprises - a rotator configured to be received by the longitudinal medicament delivery member cover, the rotator being rotatable relative to the medicament delivery member cover, wherein the medicament delivery member cover is linearly displaceable relative to the rotator and the housing, and wherein the rotator has a guide structure, wherein the guide structure has a groove that forms a closed loop and the medicament delivery member cover has a protrusion configured to run in the groove to allow the medicament delivery member cover to cooperate with the rotator and configured to guidedly cooperate with the medicament delivery member cover to cause the rotator to rotate when the medicament delivery member cover is displaced linearly relative to the rotator,and wherein the rotator is configured to be axially locked relative to the housing, wherein the medicament delivery member cover is linearly displaceable relative to the rotator from an initial position, wherein the medicament delivery member cover has a radially outwards extending stop flange which determines the amount that the medicament delivery member cover is able to be displaced in the proximal displacement, to a distal position located distally relative to the initial position, thereby rotating the rotator in a first direction, wherein the medicament delivery member cover is linearly displaceable from the distal position to a proximal position located proximally relative to the initial position, thereby rotating the rotator in a second direction opposite to the first direction, and wherein the medicament delivery member cover is linearly displaceable from the proximal position to the initial position. a housing, and an administration mechanism, wherein the housing is configured to receive the administration mechanism, wherein the administration mechanism comprises: - a longitudinal medicament delivery member cover which is biased in a proximal direction by a resilient member, and wherein the medicament delivery member cover is configured to be rotationally locked relative to the housing, characterized in that the device further comprises - a rotator configured to be received by the longitudinal medicament delivery member cover, the rotator being rotatable relative to the medicament delivery member cover, - a longitudinal medicament delivery member cover which is biased in a proximal direction by a resilient member, and wherein the medicament delivery member cover is configured to be rotationally locked relative to the housing, characterized in that the device further comprises - a rotator configured to be received by the longitudinal medicament delivery member cover, the rotator being rotatable relative to the medicament delivery member cover, wherein the medicament delivery member cover is linearly displaceable relative to the rotator and the housing, and wherein the rotator has a guide structure, wherein the guide structure has a groove that forms a closed loop and the medicament delivery member cover has a protrusion configured to run in the groove to allow the medicament delivery member cover to cooperate with the rotator and configured to guidedly cooperate with the medicament delivery member cover to cause the rotator to rotate when the medicament delivery member cover is displaced linearly relative to the rotator,and wherein the rotator is configured to be axially locked relative to the housing, wherein the medicament delivery member cover is linearly displaceable relative to the rotator from an initial position, wherein the medicament delivery member cover has a radially outwards extending stop flange which determines the amount that the medicament delivery member cover is able to be displaced in the proximal displacement, to a distal position located distally relative to the initial position, thereby rotating the rotator in a first direction, wherein the medicament delivery member cover is linearly displaceable from the distal position to a proximal position located proximally relative to the initial position, thereby rotating the rotator in a second direction opposite to the first direction, and wherein the medicament delivery member cover is linearly displaceable from the proximal position to the initial position.