To rationally perform work in an aseptic condition by connecting an upstream side instillation tube, which has a bottle needle and branches a connecting tube to a powdery medicine container in the middle, on the upstream side of a drip chamber and connecting a downstream side instillation tube, which has a human body connector and a clamp for flow control, on the downstream side of that chamber.

A main instillation line D is formed by connecting instillation tubes 41 and 42 on the upstream side and downstream side of a drip chamber 3. A line E for powdery medicine is formed by connecting a bottle needle 51 to the tip end of an upstream side instillation tube 41 and branching a connecting tube 43 in the middle. An vein needle 61 is connected to the lower end of a downstream side instillation tube 42 and the clamp for flow control such as a roll clamp 81, for example, is attached. The upstream side instillation tube 41 and the connecting tube 43 to a powdery medicine container C are respectively provided with clamps 82 and 83 for opening/closing. Thus, mental burden for worker is reduced, the powdery medicine is solved through series of work and work is rationalized.