An insertion device (100) for a fluid delivery device (105) for delivering a therapeutic fluid to a body of a patient and/or for sensing of a bodily analyte is disclosed. The insertion device includes a housing and accomodated therein at least one penetrating cartridge (150) provided with a penetrating member and with a subcutaneously insertable element The insertion device is provided with a displacement mechanism which upon actuation is capable of protracting the penetrating cartridge towards the said device for delivery and/or sensing, wherein said protracting results in inserting of the penetrating cartridge into subcutaneous compartment of the body via an opening provided at the said device for delivery and/or sensing and said insertion device allows evacuation of the penetrating member from the subcutaneous compartment via the said opening.
