A medicament delivery device comprising: - a tubular housing, having a proximal end and an opposite distal end, - actuator means, slidably and coaxially arranged inside the tubular housing comprising a generally tubular activation member, an intermediate longitudinal locking member and a proximal annular contact member; - a first resilient member arranged at the distal end of the actuator means, between an annular ledge of the tubular housing and an annular ledge of the intermediate locking member; - a medicament container holder coaxially arranged within the actuator means and fixedly attached to the tubular housing - an activating member interactively connected to the actuator means and arranged to hold the actuator means and the first resilient member in a pre-tensioned state with first co-acting means of the locking member adapted to co-act with corresponding co-acting means of the activating member; characterized in that the medicament delivery device further comprises: - a delivery member comprising a retainer member fixedly connected to the container holder, a hub coaxially movable within the retainer member and provided with a needle having a proximal and an opposite distal end, an inner cap interactively connected to the hub via second coupling means of the hub connected to a corresponding second coupling means of the inner cap, wherein the inner cap is interactively connected to the retainer member via third coupling means of the inner cap connected to corresponding third coupling means of the retainer member, and an outer cap coaxially arranged to the inner cap; wherein said outer cap is arranged rotatably spinning in relation to said inner cap when the actuator means and the first resilient member are in the pre-tensioned state; and - a cap inter-locking member axially slidable, but rotationally locked to the inner cap and arranged abutting the proximal annular contact member, and wherein said cap inter-locking member is also arranged to interact with the outer cap via co-acting means of the cap inter-locking member engaging with corresponding co-acting means when the actuator means and the first resilient member are released from their pre-tensioned state. - a tubular housing, having a proximal end and an opposite distal end, - actuator means, slidably and coaxially arranged inside the tubular housing comprising a generally tubular activation member, an intermediate longitudinal locking member and a proximal annular contact member; - a first resilient member arranged at the distal end of the actuator means, between an annular ledge of the tubular housing and an annular ledge of the intermediate locking member; - a medicament container holder coaxially arranged within the actuator means and fixedly attached to the tubular housing - an activating member interactively connected to the actuator means and arranged to hold the actuator means and the first resilient member in a pre-tensioned state with first co-acting means of the locking member adapted to co-act with corresponding co-acting means of the activating member; - a delivery member comprising a retainer member fixedly connected to the container holder, a hub coaxially movable within the retainer member and provided with a needle having a proximal and an opposite distal end, an inner cap interactively connected to the hub via second coupling means of the hub connected to a corresponding second coupling means of the inner cap, wherein the inner cap is interactively connected to the retainer member via third coupling means of the inner cap connected to corresponding third coupling means of the retainer member, and an outer cap coaxially arranged to the inner cap; wherein said outer cap is arranged rotatably spinning in relation to said inner cap when the actuator means and the first resilient member are in the pre-tensioned state; and - a cap inter-locking member axially slidable, but rotationally locked to the inner cap and arranged abutting the proximal annular contact member, and wherein said cap inter-locking member is also arranged to interact with the outer cap via co-acting means of the cap inter-locking member engaging with corresponding co-acting means when the actuator means and the first resilient member are released from their pre-tensioned state.