The present invention includes a rotatable operation knob, and a plurality of drug solution transfer lines each having an elastically deformable tube, and arranged so that the tubes are located at different heights on one side of the outer periphery of the operation knob, Depending on the tube support member that supports the tube, the chemical solution merging mechanism that merges the chemical solution from the chemical solution transfer line into a single flow, and the rotation angle of the operation knob, all the chemical solution transfer lines are opened or closed Alternatively, a chemical liquid flow rate control device including a pipe opening / closing means for selectively compressing or releasing the tube so that a part of the chemical liquid transfer line is closed, and a chemical liquid injector including the same I will provide a.本発明は、回転可能な操作ノブと、それぞれ弾性変形可能なチューブを有し、操作ノブの外周の一側にチューブが互いに異なる高さに位置するように配置された複数の薬液移送ラインと、チューブを支持するチューブ支持部材と、薬液移送ラインからの薬液を単一の流れとなるように合流させる薬液合流機構と、操作ノブの回転角度に応じて、薬液移送ラインがすべて開放または閉鎖されるか或いは薬液移送ラインのうちの一部が閉鎖されるように、前記チューブを選択的に圧迫または圧迫解除する管路開閉手段とを含んでなる、薬液流量制御装置、及びこれを含む薬液注入器を提供する。
