Injection device comprising a housing (2, 3, 50)； a container holder (10) arranged within said housing, said 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 said medicament container at the other end thereof； a first (65) and a second (70) energy accumulating member arranged in the interior of the housing of the injection device and adapted to accumulate and store energy； a sleeve (45) being slidable arranged in relation to the housing； a plunger holder arranged for being connectable to the container holder, said plunger holder being operationally associated with said first energy accumulating member such that due to an output axial force from said first energy accumulating member, the plunger holder and the container holder are axially moveable in relation to the housing a predetermined distance towards the proximal end of the injection device from an initial position to a position following needle penetration； and a plunger rod (20) being arranged with a proximal end thereof contactable with said stopper and being slidable arranged in relation to plunger holder and to the container holder, said plunger rod being operationally associated with said second energy accumulating member such that due to an output axial force from said second energy accumulating member the plunger rod is axially moveable in relation to the container holder towards the proximal end of the injection device from a locked position to a position following medicament injection, wherein, in the initial position of the plunger holder, movement of the plunger holder towards the proximal end of the injection device is substantially inhibited by at least one first biasable member (51) interacting with the plunger holder, the first biasable member recoiling when being overlapped by an opening and/or recess of the sleeve such that the plunger holder is released.
