Delivery device for the administration of a fluid active ingredient from a container (1, 1d) with a) a container (1, 1d) with at least one first chamber with an active ingredient and a second chamber (If) with a solution liquid for the active ingredient, b) wherein the container (1,1d) comprises a membrane at one end for the closure, c) a mixing device for the mixing of the active ingredient with the solution liquid for the active ingredient, d) an injection needle unit, which comprises a distal needle portion facing away from the container (1,1d) for injection into the skin and a proximal needle portion, which, in a starting position of the delivery device, is disposed facing opposite to the membrane, which, in a mixing position, pierces through the membrane into the container (1, 1d), wherein e) the delivery device further comprises a protective sleeve which can be arranged coaxially around the injection-needle unit and which, in the starting position, with the injection-needle unit retained by the protective sleeve, is displaceable relative to the container (1,1d) in the proximal direction, especially only in the proximal direction, wherein, f) in the mixing position, the protective sleeve is connectable in a rotationally rigid manner to the container (1,1d) and can be rotated relative to the mixing device, in order to mix the active ingredient with the solution liquid for the active ingredient, characterised in that, g) The delivery device further comprises a guide sleeve (6; 7), wherein the guide sleeve (6; 7) is arranged radially between the injection-needle unit and the protective sleeve and is connected at a proximal end to the container (1, 1 d) in an axially rigid manner and, that the injection-needle unit is retained in the guide sleeve (6; 7) in an axially displaceable manner and, that the protective sleeve comprises a tensible locking element, which, in the starting position, cooperates with the guide sleeve (6; 7) in such a manner that the protective sleeve with the injection-needle unit retained therein is displaceable relative to the container (1, 1d) in the proximal direction, especially only in the proximal direction. a) a container (1, 1d) with at least one first chamber with an active ingredient and a second chamber (If) with a solution liquid for the active ingredient, b) wherein the container (1,1d) comprises a membrane at one end for the closure, c) a mixing device for the mixing of the active ingredient with the solution liquid for the active ingredient, d) an injection needle unit, which comprises a distal needle portion facing away from the container (1,1d) for injection into the skin and a proximal needle portion, which, in a starting position of the delivery device, is disposed facing opposite to the membrane, which, in a mixing position, pierces through the membrane into the container (1, 1d), wherein e) the delivery device further comprises a protective sleeve which can be arranged coaxially around the injection-needle unit and which, in the starting position, with the injection-needle unit retained by the protective sleeve, is displaceable relative to the container (1,1d) in the proximal direction, especially only in the proximal direction, wherein, f) in the mixing position, the protective sleeve is connectable in a rotationally rigid manner to the container (1,1d) and can be rotated relative to the mixing device, in order to mix the active ingredient with the solution liquid for the active ingredient, g) The delivery device further comprises a guide sleeve (6; 7), wherein the guide sleeve (6; 7) is arranged radially between the injection-needle unit and the protective sleeve and is connected at a proximal end to the container (1, 1 d) in an axially rigid manner and, that the injection-needle unit is retained in the guide sleeve (6; 7) in an axially displaceable manner and, that the protective sleeve comprises a tensible locking element, which, in the starting position, cooperates with the guide sleeve (6; 7) in such a manner that the protective sleeve with the injection-needle unit retained therein is displaceable relative to the container (1, 1d) in the proximal direction, especially only in the proximal direction.