An injection device for administering a product comprising: a) A sleeve-shaped housing b) A protective needle sleeve , which is longitudinal-displaceably accommodated in the housing and simultaneously serves as trigger element, c) A product container holder , which receives a product container with a needle protection cap detachably fastened thereon, d) A driven member , which acts on the product container, e) A removing element with engagement members (3a/3d) for removing the needle protection cap from the product container , wherein f) The protective needle sleeve is axially fixed relative to the housing in the state of the injection device as dispatched and has to this end an engagement member , which engages in a form-fitting manner in an engagement counter-member (lb) on the inside of the housing and can be moved transversely to the longitudinal axis, g) The removing element has a holding section , which in the state as dispatched is located axially level with the engagement member on the inner circumference of the protective needle sleeve in order to prevent a movement of the engagement member to the inside and hence ensures that a movement of the protective needle sleeve relative to the housing in the state as dispatched is prevented, and that h) By pulling the removing element the holding section is removed and the engagement member of the protective needle sleeve is released for a movement to the inside, characterized in that i) The protective needle sleeve has a blocking member which engages in a form-fitting manner into a projection of the housing in order to prevent a retraction of the protective needle sleeve into the housing , after, at the end of a product dispense, the protective needle sleeve has been shifted beyond the distal end of a needle of the product container . a) A sleeve-shaped housing b) A protective needle sleeve , which is longitudinal-displaceably accommodated in the housing and simultaneously serves as trigger element, c) A product container holder , which receives a product container with a needle protection cap detachably fastened thereon, d) A driven member , which acts on the product container, e) A removing element with engagement members (3a/3d) for removing the needle protection cap from the product container , wherein f) The protective needle sleeve is axially fixed relative to the housing in the state of the injection device as dispatched and has to this end an engagement member , which engages in a form-fitting manner in an engagement counter-member (lb) on the inside of the housing and can be moved transversely to the longitudinal axis, g) The removing element has a holding section , which in the state as dispatched is located axially level with the engagement member on the inner circumference of the protective needle sleeve in order to prevent a movement of the engagement member to the inside and hence ensures that a movement of the protective needle sleeve relative to the housing in the state as dispatched is prevented, and that h) By pulling the removing element the holding section is removed and the engagement member of the protective needle sleeve is released for a movement to the inside, characterized in that i) The protective needle sleeve has a blocking member which engages in a form-fitting manner into a projection of the housing in order to prevent a retraction of the protective needle sleeve into the housing , after, at the end of a product dispense, the protective needle sleeve has been shifted beyond the distal end of a needle of the product container . <EOS>