PROBLEM TO BE SOLVED: To reliably obtain necessary information for managing an injection amount of a liquid medicine to a patient.SOLUTION: A counter includes: an operation detection part 27 for detecting whether a button 8 is operated a filling amount detection part 28 for detecting whether a predetermined amount of the liquid medicine is filled in a housing chamber S2 a determining part 29 for determining whether the operation detected by the detection part 27 is a deriving operation for deriving the liquid medicine based on a result of the detection by the filling amount detection part 28, when the operation of the button 8 is detected by the detection part 27 and a counted number storage part 30 for storing the number of times of the deriving operation.COPYRIGHT: (C)2012,JPO&INPIT【課題】患者に対する薬液の注入量の管理に必要な情報を確実に得ること。【解決手段】ボタン8が操作されたか否かを検出する操作検出部27と、収容室S2内に所定量の薬液が充填されているか否かを検出する充填量検出部28と、操作検出部27によりボタン8の操作が検出された場合に、充填量検出部28による検出結果に基づいて、操作検出部27により検出された操作が薬液を導出させる導出操作であるか否かを判定する判定部29と、導出操作の回数を記憶する計数記憶部30とを備えている。【選択図】図9
