Abstract: The present application relates to an inserter device for inserting a medical device subcutaneous Iy which inserter device comprises a housing (1); a cover (2) which is slidably connected to the housing (1); a hub (5) for an insertion needle (4) which can be moved linearly relative to the housing (1) and relative to the cover (2); a primary spring (6) which moves the hub (5) for the insertion needle (4) relative to the cover (2) and which primary spring (6) is configured to pull the hub (5) for the insertion needle (4) either to a forward or to a retracted position wherein the inserter device further comprises means for biasing the primary spring (6) before insertion.