An injection device for administering a fixed dose of a medicament comprising: a housing wherein a drive mechanism comprising a drive member is at least partially enclosed, one of the housing and the drive member comprising an engaging feature and the other one of the housing and the drive member having a thread, the thread having a path (41a, 41b) guiding the engaging feature, the injection device further comprising a piston rod threadedly engaged with the drive member and threadedly engaged with the housing and the injection device further comprising a dosing element, characterized in that the dosing element is permanently fixed relative to the drive member, wherein the dose can be set by rotating the dosing element relative to the housing in a dose setting direction ('s') and the dose can be dispensed by pushing the dosing element towards the housing, wherein, for setting the dose, the dosing element has to be rotated until a stop position is reached, wherein the dosing element cannot be rotated further in the dose setting direction ('s') and cannot be pulled further out of the housing when the stop position has been reached, wherein, for dispensing the dose, the dosing element at the stop position can be pushed by a user towards the housing until an end position is reached, wherein during this movement the medicament is dispensed, and wherein a set dose can be cancelled by rotating the dosing element in a direction opposite to the dose setting direction ('s'), and in that the thread is closed in itself. a housing wherein a drive mechanism comprising a drive member is at least partially enclosed, one of the housing and the drive member comprising an engaging feature and the other one of the housing and the drive member having a thread, the thread having a path (41a, 41b) guiding the engaging feature, the injection device further comprising a piston rod threadedly engaged with the drive member and threadedly engaged with the housing and the injection device further comprising a dosing element, characterized in that the dosing element is permanently fixed relative to the drive member, wherein the dose can be set by rotating the dosing element relative to the housing in a dose setting direction ('s') and the dose can be dispensed by pushing the dosing element towards the housing, wherein, for setting the dose, the dosing element has to be rotated until a stop position is reached, wherein the dosing element cannot be rotated further in the dose setting direction ('s') and cannot be pulled further out of the housing when the stop position has been reached, wherein, for dispensing the dose, the dosing element at the stop position can be pushed by a user towards the housing until an end position is reached, wherein during this movement the medicament is dispensed, and wherein a set dose can be cancelled by rotating the dosing element in a direction opposite to the dose setting direction ('s'), and in that the thread is closed in itself. wherein, for setting the dose, the dosing element has to be rotated until a stop position is reached, wherein the dosing element cannot be rotated further in the dose setting direction ('s') and cannot be pulled further out of the housing when the stop position has been reached, wherein, for dispensing the dose, the dosing element at the stop position can be pushed by a user towards the housing until an end position is reached, wherein during this movement the medicament is dispensed, and wherein a set dose can be cancelled by rotating the dosing element in a direction opposite to the dose setting direction ('s'), and in that the thread is closed in itself.