PROBLEM TO BE SOLVED: To provide a drug solution delivery device which is applied in delivering a drug solution such as insulin into a human body and can correctly deliver the drug solution.SOLUTION: Umbrella valves 138, 139 disposed on the midway of a flow path for sending a drug solution into a human body from a drug solution bag 110 for storing the drug solution by a sending portion 130 are held on both ends, and equipped in umbrella-like portions 138B, 139B with shock absorbing portions 138F, 139F for diverting a force from valve abutting surfaces 140D, 131H. By having the shock absorbing portions 138F, 139F, the valves are deformed and abut while diverting the force applied when the front end portions 138C, 139C abut on the valve abutting portions 140D, 131H. Thus, the influence of shape forming error can be reduced and a predetermined valve opening pressure can be achieved, so that the drug solution delivery accuracy can be improved.COPYRIGHT: (C)2013,JPO&INPIT【課題】本発明は、精度よく薬液を投与する。【解決手段】本発明は、薬液を貯蔵する薬液バッグ110から送出部130により体内へ薬液を送るための流路の途中に設けられたアンブレラ弁138及び139は、両端から挟持され、傘状部138B及び139Bに弁当接面140D及び131Hからの力を逸らす緩衝部138F及び139Fが設けられるので、緩衝部138F及び139Fを有することにより、弁当接面140D及び131Hに先端部138C及び139Cが当接する際の力を逸らしながら変形して当接するので、成形誤差の影響を小さくすることができ、規定の開弁圧が実現できるので、薬液の投与精度を向上させることができる。【選択図】図8
