PROBLEM TO BE SOLVED: To provide a chemical feeder and a CT apparatus which suppresses a chemical use amount and allows easy inspection with high through-put.SOLUTION: A chemical feeder 100 comprises: two piston drive mechanisms 130 for respectively moving forward a piston of a syringe; a main injection condition determination part 171 for determining a chemical injection condition in main injection; a test injection condition determination part 172 for determining a chemical injection condition in test injection for injecting a chemical with an amount less than that in the main injection, before performing the main injection; and a control part 161 for, creating an injection protocol according to the injection condition determined by the test injection condition determination part 172 and the main injection condition determination part 171, so that the chemical is injected by a series of operations in which the main injection is performed after passing of a preset injection intermittent time after the test injection is performed, and controlling the operation of the piston drive mechanism 130 according to the injection protocol.SELECTED DRAWING: Figure 4【課題】薬液の使用量を抑えつつ、より簡便に、かつ高いスループットでの検査を可能とする薬液注入装置およびCT装置を提供する。【解決手段】薬液注入装置100は、それぞれシリンジのピストンを前進させる2つのピストン駆動機構130と、本注入での薬液の注入条件を決定する本注入条件決定部171と、本注入に先立って本注入での注入量よりも少ない注入量で薬液を注入するテスト注入での薬液の注入条件を決定するテスト注入条件決定部172と、テスト注入の後、予め設定された注入中断時間をおいて本注入が行なわれる一連の動作で薬液が注入されるように、テスト注入条件決定部172および本注入条件決定部171で決定された注入条件に従って注入プロトコルを作成し、注入プロトコルに従ってピストン駆動機構130の動作を制御する制御部161と、を有する。【選択図】図4