An injection device for expelling a drug from a syringe, the injection device comprising: - a housing formed to be gripped by a subject user, the housing extending along a central longitudinal axis, and defining a distal needle end and an opposite proximal end, - syringe retaining means, - a syringe comprising a barrel mounted relative to the syringe retaining means, an injection needle, and a needle shield arranged over the injection needle; and - a cap assembly comprising a cap body covering a distal end of the syringe, and a shield remover adapted to engage the needle shield, the shield remover being axially fixed relative to the cap body; wherein the injection device defines: - a distally facing surface arranged axially fixed relative to the housing, and - a shield removal mechanism comprising a cam interface adapted to axially separate the needle shield from the injection needle upon rotation of the cap body relative to the housing, characterized in that the cap assembly further comprises an elevation member being movable rotationally and axially relative to the cap body, wherein the elevation member comprises a proximally facing surface configured for engaging the distally facing surface, and wherein the elevation member comprises a first rotation preventing geometry (18, 28, 31) configured to prevent the elevation member from rotating relative to the housing, wherein said cam interface comprises engaging cam surfaces respectively disposed on the elevation member and the cap body, the cam surfaces being configured to engage slidingly upon rotation of the cap body relative to the housing so as to cause the proximal facing surface of the elevation member to be axially forced against the distally facing surface while moving the cap body, the shield remover and the needle shield distally relative to the housing. - a housing formed to be gripped by a subject user, the housing extending along a central longitudinal axis, and defining a distal needle end and an opposite proximal end, - syringe retaining means, - a syringe comprising a barrel mounted relative to the syringe retaining means, an injection needle, and a needle shield arranged over the injection needle; and - a cap assembly comprising a cap body covering a distal end of the syringe, and a shield remover adapted to engage the needle shield, the shield remover being axially fixed relative to the cap body; - a distally facing surface arranged axially fixed relative to the housing, and - a shield removal mechanism comprising a cam interface adapted to axially separate the needle shield from the injection needle upon rotation of the cap body relative to the housing, characterized in that the cap assembly further comprises an elevation member being movable rotationally and axially relative to the cap body, wherein the elevation member comprises a proximally facing surface configured for engaging the distally facing surface, and wherein the elevation member comprises a first rotation preventing geometry (18, 28, 31) configured to prevent the elevation member from rotating relative to the housing, wherein said cam interface comprises engaging cam surfaces respectively disposed on the elevation member and the cap body, the cam surfaces being configured to engage slidingly upon rotation of the cap body relative to the housing so as to cause the proximal facing surface of the elevation member to be axially forced against the distally facing surface while moving the cap body, the shield remover and the needle shield distally relative to the housing.