A Device (1) for inserting at least one insertion member (11, 12) having a puncturing tip (9), in particular at least one infusion cannula and/or at least one sensor tip, into the tissue of the body of a patient and for fixing it to the skin of the body, comprises a housing (2, 2a, 2b, 10, 21) providing at least one contact face (3) for placing the device (1) onto the skin of the body of the patient, wherein the contact face (3) carries a layer (4) of skin compatible glue for fixing it to the skin, which layer (4) in particular is covered by a removable protecting layer (5), an insertion arrangement (6) movably arranged within the housing comprising the at least one insertion member (11, 12) to be inserted into the tissue and a holder element (7) fixedly connected with at least a part (11) of the at least one insertion member (11, 12) which is intended to remain for a longer period inside the tissue of the body, and drive means (8) arranged within the housing for effecting an insertion movement of the insertion arrangement (6) from a first position, in which the puncturing tip (9) of the at least one insertion member (11, 12) is set back relative to the contact face (3), into a second position, in which the puncturing tip (9) of the at least one insertion member (11, 12) protrudes beyond the contact face (3), so that the at least one insertion member (11, 12) is inserted into the tissue of the body of the patient when the device (1) during the insertion movement of the insertion arrangement (6) is placed with its contact face (3) on said body, wherein the contact face (3) is formed by a base plate (10) which is fixed in such a manner that, after the insertion movement has been performed, it is detachable from the rest of the housing, wherein the holder element (7) of the insertion arrangement (6) comprises coupling means (23) by which it is coupled to the base plate (10) when the insertion arrangement (6) by the insertion movement is brought into the second position
