Medicament delivery device comprising - a generally elongated housing having a distal end and a proximal end with a proximal housing part along a longitudinal axis, the housing being arranged to accommodate a medicament container enclosing a medicament, and a medicament delivery member connected to the medicament container, the medicament delivery device comprising: - a reloadable drive mechanism capable of, upon activation, act on said medicament container; characterized in that the medicament delivery device further comprises - a medicament delivery member cover operably arranged at the proximal end of the device and slidable in relation to the housing along the longitudinal axis between an extended position, where a proximal tubular portion of the medicament delivery member cover protrudes from the transversal proximal end of the proximal housing part, and a retracted position, where the transversal proximal end of the proximal tubular portion of the medicament delivery member cover is flush with the proximal transversal end of the proximal housing part; and - a medicament delivery member cover lock mechanism comprising: - a first lock member movably provided on an actuator that is movably arranged in relation to the housing; and - a second lock member provided on said medicament delivery member cover, wherein the first lock member is operably engageable with the second lock member for blocking movement of said medicament delivery member cover at said extended position, whereby the first lock member is positioned inside the second lock member, and wherein the actuator is movable in a direction generally transversal to the longitudinal axis in relation to the medicament delivery member cover, wherein manual actuation of said actuator causes the first lock member to be moved out of engagement with the second lock member of said medicament delivery member cover, thereby allowing said medicament delivery member cover to be moved to said retracted position. - a generally elongated housing having a distal end and a proximal end with a proximal housing part along a longitudinal axis, the housing being arranged to accommodate a medicament container enclosing a medicament, and a medicament delivery member connected to the medicament container, the medicament delivery device comprising: - a reloadable drive mechanism capable of, upon activation, act on said medicament container; characterized in that the medicament delivery device further comprises - a medicament delivery member cover operably arranged at the proximal end of the device and slidable in relation to the housing along the longitudinal axis between an extended position, where a proximal tubular portion of the medicament delivery member cover protrudes from the transversal proximal end of the proximal housing part, and a retracted position, where the transversal proximal end of the proximal tubular portion of the medicament delivery member cover is flush with the proximal transversal end of the proximal housing part; and - a medicament delivery member cover lock mechanism comprising: - a first lock member movably provided on an actuator that is movably arranged in relation to the housing; and - a second lock member provided on said medicament delivery member cover, wherein the first lock member is operably engageable with the second lock member for blocking movement of said medicament delivery member cover at said extended position, whereby the first lock member is positioned inside the second lock member, and wherein the actuator is movable in a direction generally transversal to the longitudinal axis in relation to the medicament delivery member cover, wherein manual actuation of said actuator causes the first lock member to be moved out of engagement with the second lock member of said medicament delivery member cover, thereby allowing said medicament delivery member cover to be moved to said retracted position. - a first lock member movably provided on an actuator that is movably arranged in relation to the housing; and - a second lock member provided on said medicament delivery member cover, wherein the first lock member is operably engageable with the second lock member for blocking movement of said medicament delivery member cover at said extended position, whereby the first lock member is positioned inside the second lock member, and wherein the actuator is movable in a direction generally transversal to the longitudinal axis in relation to the medicament delivery member cover, wherein manual actuation of said actuator causes the first lock member to be moved out of engagement with the second lock member of said medicament delivery member cover, thereby allowing said medicament delivery member cover to be moved to said retracted position.