A fluid dispensing device comprising: a body (1); and a dispensing head (2) having an administration opening (3) and being movable in an axial direction with respect to the body (1) when driven, ) Accommodates a reservoir (10) for storing a fluid, the reservoir (10) has a hollow tube (11), the proximal axial opening (12) of the hollow tube (11) is a stopper (20), said stopper (20) sliding in the hollow tube (11) while keeping hermetically closed during driving, said dosing head (2) having a hollow cannula (4), said cannula 4) has a penetrating end (5) for connecting to the administration opening (3) at one end and a stopper (20) at the other end, the penetrating end (5) having an opening (6) The cannula (4) has a cannula support (2) secured to the dispensing head (2) Wherein the cannula support has a central axial bore and the inner diameter of the central axial bore is equal to the outer diameter of the cannula or is smaller than the outer diameter of the cannula , The cannula support (9) further comprises a radially inwardly extending radial projection at its distal axial end, the inner diameter of the radial projection being greater than the diameter of the cannula (4), slightly smaller than the outer diameter of the cannula (4), and smaller than the inner diameter of the central axial borehole.BACKGROUND OF THE INVENTION流体投与装置であって、本体(1)と、投与開口(3)を有し駆動時には本体(1)に対して軸方向に移動可能な投与ヘッド(2)とを有し、前記本体(1)は流体を格納する貯留部(10)を収容し、当該貯留部(10)は中空管(11)を有し、当該中空管(11)の近接側軸方向開口(12)はストッパー(20)によって閉じられ、当該ストッパー(20)は駆動時に密閉状態を保ちつつ中空管(11)内をスライドし、前記投与ヘッド(2)は中空カニューレ(4)を有し、当該カニューレ(4)はその一端において投与開口(3)に接続するとともに他端にストッパー(20)を貫通するための貫通端(5)を有し、貫通端(5)は開口(6)を有し、前記カニューレ(4)は投与ヘッド(2)に固定されたカニューレ支持部(9)に挿入されており、当該カニューレ支持部(9)は中央軸方向穿孔を有し、当該中央軸方向穿孔の内径は、カニューレ(4)の外径と等しいかカニューレ(4)の外径よりもわずかに大きく、前記カニューレ支持部(9)はさらに、その遠位側軸方向端部において、径方向内側に延出する径方向突出部を有し、当該径方向突出部の内径は、カニューレ(4)の外径と等しいかカニューレ(4)の外径よりもわずかに小さく、且つ中央軸方向穿孔の内径よりも小さい、流体投与装置。【選択図】 図1