A dose limiting mechanism for an injection device for injecting at least one dose of medication from a reservoir comprising: a housing with a distal and a proximal end, the housing having a longitudinal axis whereby the reservoir is located at the distal end of the housing, a first part which is rotated over a first angle during setting of a dose, a second part which does not rotate during setting of a dose, a third part which is operatively coupled to the first part such that during each revolution of the first part, the third part is rotated during the setting of a dose by the first part over at least one discrete angular step which is a fraction of the first angle, the rotation axis of the first, second and third part are approximately around and/or parallel to the longitudinal axis of the housing, the second part comprises a stop member which prevents further rotation of the third part when the third part has been rotated over a second angle, thereby limiting the dose setting to a predetermined amount of medication present in the reservoir, characterized by that the third part is urged to axially shift back and forth during dose setting between a proximal and a distal position due to engagement of coupling members (3f, 2j, 3g, 2m) present at the third part and the second part the axial shifts are urged by sloped structures which are present at or part of the coupling members (3f, 2j, 3g, 2m) and the interaction of two engaging coupling members which slide across each other urge the axial movement of the third part during rotation over the discrete angular step whereby during each axial shift the third part is rotated over one discrete angular step, wherein the first part is an outer sleeve axially fixed with respect to the housing having at least two guiding elements (1c, 1d) and the at least two guiding elements (1c, 1d) guide the third part during each revolution such that the third part is rotated over the discrete angular step and is axially secured in the proximal or distal position, wherein the third part has a steering means wherein the guiding elements (1c, 1d) of the first part abut the steering means such that rotation of the first part is transmitted to the third part. a housing with a distal and a proximal end, the housing having a longitudinal axis whereby the reservoir is located at the distal end of the housing, a first part which is rotated over a first angle during setting of a dose, a second part which does not rotate during setting of a dose, a third part which is operatively coupled to the first part such that during each revolution of the first part, the third part is rotated during the setting of a dose by the first part over at least one discrete angular step which is a fraction of the first angle, the rotation axis of the first, second and third part are approximately around and/or parallel to the longitudinal axis of the housing, the second part comprises a stop member which prevents further rotation of the third part when the third part has been rotated over a second angle, thereby limiting the dose setting to a predetermined amount of medication present in the reservoir, characterized by that the third part is urged to axially shift back and forth during dose setting between a proximal and a distal position due to engagement of coupling members (3f, 2j, 3g, 2m) present at the third part and the second part the axial shifts are urged by sloped structures which are present at or part of the coupling members (3f, 2j, 3g, 2m) and the interaction of two engaging coupling members which slide across each other urge the axial movement of the third part during rotation over the discrete angular step whereby during each axial shift the third part is rotated over one discrete angular step, wherein the first part is an outer sleeve axially fixed with respect to the housing having at least two guiding elements (1c, 1d) and the at least two guiding elements (1c, 1d) guide the third part during each revolution such that the third part is rotated over the discrete angular step and is axially secured in the proximal or distal position, wherein the third part has a steering means wherein the guiding elements (1c, 1d) of the first part abut the steering means such that rotation of the first part is transmitted to the third part.