An injection device (1) has a housing (2) in which a seat is formed for a container (5) with injection liquid. The injection device (1) has a control knob (8) for setting an amount of injection liquid to be forced out of the container (5). The control knob (8) is rotatable for this purpose. During the rotation, the control knob (8) moves in the direction of a longitudinal centre axis (6) of the injection device (1) in a distal direction relative to the housing (2). To force injection liquid out of the container (5), the control knob (8) is moved in the direction of the longitudinal centre axis (6) in the proximal direction of the injection device (1). When setting the amount of injection liquid to be forced out, the control knob (8) can be adjusted to at least one injection position (100), in which an admissible amount of injection liquid is set, and to at least one blocking position (101), in which an inadmissible amount of injection liquid is set. In the injection position (100), the control knob (8) is movable in the direction of the longitudinal centre axis (6) in the proximal direction. To avoid the injection of an inadmissible amount of injection liquid, provision is made that, in the blocking position (101), the movement of the control knob (8) is blocked in the direction of the longitudinal centre axis (6) in the proximal direction.La presente invención se relaciona con un dispositivo de inyección (1) que tiene un receptáculo (2), en el cual se forma un portador para un envase (5) teniendo líquido inyectable. El dispositivo de inyección (1) tiene un botón de mando (8) para fijar una cantidad de líquido inyectable que ha de expulsarse del envase (5). El botón de mando (8) puede girar para esta finalidad. Durante el giro el botón de mando (8) se mueve en la dirección de un eje central longitudinal (6) del dispositivo de inyección (1) en una dirección distal relativa al receptáculo (2). Para expulsar el líquido inyectable del envase (5) se mueve el botón de man
