PROBLEM TO BE SOLVED: To provide a medical solution bag, when an enclosed medical solution is a small amount, allowing a healthcare personnel and a patient to recognize, at a glance, reliance of medical solution administration and a residual amount of the medical solution by clearly representing a change in a position of a liquid level during a drip infusion.SOLUTION: A medical solution bag 1 includes: a bag body 10 having an upper end 12, a lower end 13, and a chamber 11 in which medical solution 30 can be enclosed and an outflow port 21 attached to the lower end 12 for letting out the medical solution 30. An inner length L of the chamber 11 enclosing the medical solution 30, from the upper end 12 to the lower end 13, is defined to 1.8-15 times a chamber inner width W that is orthogonal to the direction of a chamber inner length L, and a volume is defined to 50-250 mL.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】封入している薬液が少量である場合、点滴中に液面の位置の変化を明確に示し、薬液投与の確実性や薬液の残量を、医療従事者や患者が一見して確認できる薬液バッグを提供する。【解決手段】薬液バッグ1は、上端部12及び下端部13を有し、薬液30を封入可能な薬室11を有する袋本体10と、下端部12に取り付けられて薬液30を流出させる流出ポート21とを、備えており、薬液30を封入した薬室11が、上端部12側から前記下端部13側までの薬室内長さLを薬室内長さL方向に直交する薬室内幅Wに対して1.8~15倍とし、かつ容量を50~250mLとするものである。【選択図】図1