Needle protection device, which is disconnectably fitted or can be fitted to an injection unit, with the needle protection device comprising: a) an injection needle with a needle connection section extending to a distal end of the injection needle end of the injection needle, b) a needle holder, from which the needle injection section projects in the distal direction and the needle connection section projects in the proximal direction, c) a distal needle protection, moveable connected with the needle holder, which can be moved from a release position in the distal direction up to a protected position, wherein the distal needle protection stands back behind the needle injection section in the release position and overlaps the needle injection section including the distal end of the injection needle in the protected position, d) a proximal needle protection (7; 27), moveably connected with the needle holder, which can be moved from a release position in the proximal direction up to a protected position, wherein the proximal needle protection (7; 27) stands back behind and overlaps the needle connection section including the proximal end of the injection needle in the release position, e) a block means (9, 15, 8; 9, 28, 30), which blocks a movement of the proximal needle protection (7, 27) from its protected position into its release position, f) wherein the block means (9, 15, 8, 9, 28, 30) comprises a first blocking member formed by the needle holder or connected with the needle holder, and a second blocking member (15; 28) formed by the proximal needle protection (7; 27) or connected with the proximal needle protection, that the second blocking member (15, 28) arrives in a blocking engagement with the first blocking member during the movement of proximal needle protection (7; 27) in the proximal direction, which prevents a movement of the proximal needle protection (7; 27) back in the distal direction when the proximal needle protection (7; 27) has reached its protection position, and that the needle holder cannot be moved in the proximal direction relative to the first blocking member, and the proximal needle protection (7; 27) cannot be moved in the distal direction relative to the second blocking member (15; 28) at least when the proximal needle protection (7; 27) is in the protection position, g) characterised in that the blocking means comprises a deblocking member (8; 30), which can be moved from a deblocking position, in which it prevents the deblocking action, into a neutral position, in which it allows the blocking action, relative to the proximal needle protection (7; 27), preferably also relative to the needle holder. a) an injection needle with a needle connection section extending to a distal end of the injection needle end of the injection needle, b) a needle holder, from which the needle injection section projects in the distal direction and the needle connection section projects in the proximal direction, c) a distal needle protection, moveable connected with the needle holder, which can be moved from a release position in the distal direction up to a protected position, wherein the distal needle protection stands back behind the needle injection section in the release position and overlaps the needle injection section including the distal end of the injection needle in the protected position, d) a proximal needle protection (7; 27), moveably connected with the needle holder, which can be moved from a release position in the proximal direction up to a protected position, wherein the proximal needle protection (7; 27) stands back behind and overlaps the needle connection section including the proximal end of the injection needle in the release position, e) a block means (9, 15, 8; 9, 28, 30), which blocks a movement of the proximal needle protection (7, 27) from its protected position into its release position, f) wherein the block means (9, 15, 8, 9, 28, 30) comprises a first blocking member formed by the needle holder or connected with the needle holder, and a second blocking member (15; 28) formed by the proximal needle protection (7; 27) or connected with the proximal needle protection, that the second blocking member (15, 28) arrives in a blocking engagement with the first blocking member during the movement of proximal needle protection (7; 27) in the proximal direction, which prevents a movement of the proximal needle protection (7; 27) back in the distal direction when the proximal needle protection (7; 27) has reached its protection position, and that the needle holder cannot be moved in the proximal direction relative to the first blocking member, and the proximal needle protection (7; 27) cannot be moved in the distal direction relative to the second blocking member (15; 28) at least when the proximal needle protection (7; 27) is in the protection position, g) characterised in that the blocking means comprises a deblocking member (8; 30), which can be moved from a deblocking position, in which it prevents the deblocking action, into a neutral position, in which it allows the blocking action, relative to the proximal needle protection (7; 27), preferably also relative to the needle holder.