A dosing device (20) has been proposed, in particular for subcutaneous administration of fluids. The dosing device comprises a transfer device (21) for transferring the fluid from the inner chamber of the container. Fluid can be transferred from the container to the dispensing opening (24) by the transfer device (21). Furthermore, an injection device (1) for subcutaneous administration of fluid is disclosed. The injection device (1) comprises a puncture cannula (2) and an indwelling cannula (3), and in the starting state the distal end region of the puncture cannula (2) is the indwelling cannula (3) Extends concentrically in the interior of the The device (1) comprises first and second runners (4, 5) slidably supported. The first runner (4) is connected to the puncture cannula and the second runner (5) is connected to the indwelling cannula. The device (1) further comprises a control element (6) movable over a predefined control area. The control element (6) is operatively connectable to the first runner and the second runner for sliding the first runner (4) and the second runner (5). The control element (6) is configured in the first part of the control area to cause the two runners (4, 5) to slide in the same direction, in particular simultaneously, and thus to mount the indwelling cannula There is. The control element (6) causes the locking of the second runner (5) and thus the holding of the indwelling cannula (3) in the second part of the control area, and the first runner (4). B) the back slide of the indwelling cannula (3) and hence the withdrawal from the distal end region of the indwelling cannula (3) to the end position of the puncture cannula (2).流体を特に皮下投与するための投与装置（２０）が提案されている。この投与装置は、容器の内室から流体を搬送するための搬送装置（２１）を含む。流体はこの搬送装置（２１）によって容器から投与開口（２４）へと搬送可能である。さらに、流体の皮下投与のための注入装置（１）が開示されている。この注入装置（１）は、穿刺カニューレ（２）と留置カニューレ（３）とを有しており、出発状態では、穿刺カニューレ（２）の遠位側の端部領域が、留置カニューレ（３）の内部に同心的に延在している。この装置（１）は、摺動可能に支持された第１および第２のランナ（４，５）を有している。第１のランナ（４）は穿刺カニューレに、第２のランナ（５）は留置カニューレに接続され
