The invention relates to an injection device comprising a housing, a container holder arranged within said housing, the container holder being configured for accommodating a medicament container having a needle attached to one end thereof and a stopper sealingly and slidable arranged inside the medicament container at the other end thereof, a drive unit comprising a plunger rod and plunger drive means, the plunger drive means being slidable arranged in relation to the plunger rod, being rotationally locked to the plunger rod and being rotatable in relation to the housing, said drive unit further comprising a first energy accumulating member arranged in the interior of the housing of the injection device and adapted to accumulate and store energy, wherein said plunger drive means is operationally associated with said first energy accumulating member, wherein the plunger drive means is releasable such that due to an output torque from said first energy accumulating member, the plunger drive means are allowed to be rotated and the plunger rod is urged towards the proximal end of the injection device whereby an injection is performed, and a rotary injection indication mechanism configured for indicating to the user the progress of the injection, wherein the rotary injection indication mechanism comprises a signalling member and a drive mechanism for rotationally driving said signalling member, said signalling member being coupled to said drive mechanism, said drive mechanism being coupled to said plunger drive means at the distal end of said plunger drive means, said rotary injection indication mechanism being arranged such that the progress of injection is shown through at least one opening provided at least in a distal end surface of the housing.本發明有關一注射裝置，包括外殼；容器夾具，被配置在該外殼內，該容器夾具被建構用於容納一藥物容器，並具有附著至其一端部之針、及一在其另一端部密封地及可滑動地配置在該藥物容器內側之塞子；驅動單元，包括柱塞桿及柱塞驅動機構，該柱塞驅動機構係關於該柱塞桿可滑動地配置，被旋轉式鎖定至該柱塞桿及可關於該外殼旋轉，該驅動單元另包括第一蓄能構件，其被配置於該注射裝置的外殼之內部中，且被設計成適於蓄積與儲存能量，其中該柱塞驅動機構係與該第一蓄能構件操作地相聯；其
