Insertion device for an insertion head with an infusion cannula or with a puncturing tip for introduction into the body of a patient, comprising a) at least one contact face for placing the insertion device on an application site on the body of the patient for application of the insertion head, b) retention means with which the insertion head that is to be applied is temporarily held on the insertion device, and c) drive means (3, 4) for effecting an insertion movement of the insertion head relative to the contact face, in the longitudinal direction of the infusion cannula or of the puncturing tip, from a first position, in which the insertion head is held by the retention means in such a way that the infusion cannula or the puncturing tip is set back relative to the contact face, to a second position, in which the infusion cannula or the puncturing tip protrudes substantially completely beyond the contact face, to permit introduction of the infusion cannula or of the puncturing tip into the body of the patient when the insertion movement is executed with the contact face of the insertion device placed on the body, the drive means (3, 4) having at least one energy-storing element for providing the drive energy for the insertion movement, in particular a helical spring, leg spring or leaf spring made of metal, or a rubber spring element, d) at least two actuation members (6, 6a, 6b, 7), which have to be actuated simultaneously to trigger the insertion movement, wherein a first of the actuation members is designed in such a way that it can be actuated by means of the contact face of the insertion device being pressed onto the body of the patient, particularly in the direction of the insertion movement of the insertion head, characterized by - the insertion device being designed in such a way that the energy-storing element of the drive means (3, 4) can be pretensioned by the user, in particular repeatedly, and can be made ready in the pretensioned state, - the drive means (3, 4) comprising a thrust element for transmitting the drive energy to the insertion head to be applied and are designed in such a way that, by displacing the thrust element counter to the direction of the insertion movement and subsequently locking it with locking means that can be released by the actuation members (6, 6a, 6b, 7), the energy-storing element is pretensioned. a) at least one contact face for placing the insertion device on an application site on the body of the patient for application of the insertion head, b) retention means with which the insertion head that is to be applied is temporarily held on the insertion device, and c) drive means (3, 4) for effecting an insertion movement of the insertion head relative to the contact face, in the longitudinal direction of the infusion cannula or of the puncturing tip, from a first position, in which the insertion head is held by the retention means in such a way that the infusion cannula or the puncturing tip is set back relative to the contact face, to a second position, in which the infusion cannula or the puncturing tip protrudes substantially completely beyond the contact face, to permit introduction of the infusion cannula or of the puncturing tip into the body of the patient when the insertion movement is executed with the contact face of the insertion device placed on the body, the drive means (3, 4) having at least one energy-storing element for providing the drive energy for the insertion movement, in particular a helical spring, leg spring or leaf spring made of metal, or a rubber spring element, d) at least two actuation members (6, 6a, 6b, 7), which have to be actuated simultaneously to trigger the insertion movement, wherein a first of the actuation members is designed in such a way that it can be actuated by means of the contact face of the insertion device being pressed onto the body of the patient, particularly in the direction of the insertion movement of the insertion head, - the insertion device being designed in such a way that the energy-storing element of the drive means (3, 4) can be pretensioned by the user, in particular repeatedly, and can be made ready in the pretensioned state, - the drive means (3, 4) comprising a thrust element for transmitting the drive energy to the insertion head to be applied and are designed in such a way that, by displacing the thrust element counter to the direction of the insertion movement and subsequently locking it with locking means that can be released by the actuation members (6, 6a, 6b, 7), the energy-storing element is pretensioned.