Injection device comprising a cartridge (3; 103) containing a medicament and a drive mechanism, the drive mechanism comprising: - a housing (4, 5; 104, 105), - a dial member (6; 106), coupled to one end of a torsion spring, - a drive member, (8; 108) engaging a lead screw (9; 109), which functions as a piston rod for expelling medicament from a cartridge during dose dispensing, - a first clutch (18; 118) rotationally coupling the drive member (8; 108) and the housing (4, 5; 104, 105) in a coupled state during dose setting and allowing relative rotation between the drive member (8; 108) and the housing (4, 5; 104, 105) in a de-coupled state during dose dispensing, - a second clutch (19; 119) rotationally coupling the drive member (8; 108) and the dial member (6; 106) in a coupled state during dose dispensing and allowing relative rotation between the drive member (8; 108) and the dial member (6; 106) in a de-coupled state during dose setting, - a nut (11, 111), which is rotationally constrained to the drive member (8; 108) and threadedly engaged to the dial member (6; 106), wherein the nut (11; 111) prevents setting of a dose exceeding the amount of a medicament in the cartridge (3; 103) and - an end stop limiting movement of the nut (11; 111), wherein the end stop defines the length of a track on which the nut (11; 111) travels during dose setting, and wherein the length of the track corresponds to the total amount of medicament in the cartridge (3; 103). wherein the drive member (8; 108) and the dial member (6; 106) rotate relative to each other during dose setting and dose resetting, and wherein the drive member (8; 108) and the dial member (6; 106) rotate together during dose dispensing, characterized in that the dial member is an axially not moving dial member (6; 106), and that during dose setting and dose resetting the dial member (6; 106) and the drive member (8; 108) do not move axially with respect to the housing (4, 5; 104, 105). - a housing (4, 5; 104, 105), - a dial member (6; 106), coupled to one end of a torsion spring, - a drive member, (8; 108) engaging a lead screw (9; 109), which functions as a piston rod for expelling medicament from a cartridge during dose dispensing, - a first clutch (18; 118) rotationally coupling the drive member (8; 108) and the housing (4, 5; 104, 105) in a coupled state during dose setting and allowing relative rotation between the drive member (8; 108) and the housing (4, 5; 104, 105) in a de-coupled state during dose dispensing, - a second clutch (19; 119) rotationally coupling the drive member (8; 108) and the dial member (6; 106) in a coupled state during dose dispensing and allowing relative rotation between the drive member (8; 108) and the dial member (6; 106) in a de-coupled state during dose setting, - a nut (11, 111), which is rotationally constrained to the drive member (8; 108) and threadedly engaged to the dial member (6; 106), wherein the nut (11; 111) prevents setting of a dose exceeding the amount of a medicament in the cartridge (3; 103) and - an end stop limiting movement of the nut (11; 111), wherein the end stop defines the length of a track on which the nut (11; 111) travels during dose setting, and wherein the length of the track corresponds to the total amount of medicament in the cartridge (3; 103).