The present invention refers to a kind of handheld injection device, including a shell (10), one rotatable dose (80,60), power reservoir (90) are connected to dose set-ting member, wherein energy is stored in the rotation Dose setting member of power station reservoir, releasing member (70), for the power of recipient, and rotatable actuator (40) engagement drives the piston rod (30) of crawler belt (32). The equipment further includes loosening clutch (100 230) rotation, which is limited in, shell and is releasably engaged actuator, wherein loosening clutch can be in the first axial position, when the release member is in dose setting position and in second axial position, when the release member is located at dose injecting position. The axial position of the actuator, remains unchanged in shell, when the release member is in dose setting position and in its dose injecting position.
