The medical liquid feeding device includes a path defining unit that defines a communication path that allows communication between the liquid feeding path and the suction path, and the liquid flowing out to the liquid feeding path with an outflow amount that is greater than or equal to a reference outflow amount. And a suction unit that performs suction through the suction path, and a liquid feeding unit that generates a state in which the liquid is not always missing in the liquid feeding direction to the communication path. In addition, the medical liquid feeding device flows into the suction path from the liquid feeding path via the communication path by controlling the suction amount of the suction unit based on the switching operation at the liquid feeding mode input unit. A control unit that adjusts the inflow amount of the liquid between the liquid supply ON mode and the liquid supply OFF mode.医療用送液装置は、送液経路と吸引経路との間を連通させる連通経路を規定する経路規定部と、基準流出量以上の流出量で前記送液経路に液体を流出することにより、前記連通経路まで送液方向について前記液体の欠落部分が常時ない状態を前記送液経路において発生させる送液ユニットと、前記吸引経路を介して吸引を行う吸引ユニットと、を備える。また、医療用送液装置は、送液モード入力部での前記切替え操作に基づいて前記吸引ユニットの吸引量を制御することにより、前記連通経路を介して前記送液経路から前記吸引経路へ流入する前記液体の流入量を、送液ＯＮモードと送液ＯＦＦモードとの間で調整する制御ユニットを備える。
