Provided is a chemical solution administration device capable of obtaining a residual amount of a chemical solution remaining in a user's living body in consideration of a user's activity and administering the chemical solution with an appropriate liquid feeding amount based on the residual amount. The purpose is to do. An apparatus based on a movement of a user's body, a liquid feeding section 100 for feeding a liquid medicine into a living body, a first control section 260 for controlling a liquid feeding operation by the liquid feeding section, and a liquid feeding apparatus. Activity detecting unit 60 for detecting the liquid, second storage unit 51 for storing already-sent liquid data related to the amount of liquid medicine delivered to the living body by the liquid-sending unit, and already-sent liquid data stored by the second storage unit A calculation unit 261 that calculates a remaining amount of the medical solution in the living body based on the activity detected by the activity detecting unit, and calculates a planned liquid delivery amount of the chemical solution to be administered to the living body based on the remaining amount of the chemical solution； Have. And a 1st control part controls the liquid feeding operation movement of a liquid feeding part so that the chemical liquid of the liquid feeding scheduled amount may be liquid-fed to a biological body. [Selection] Figure 7【課題】使用者の活動を考慮して使用者の生体内に残存する薬液の残存量を求め、当該残存量に基づいた適切な送液量で薬液の投与を実施し得る薬液投与装置を提供することを目的とする。【解決手段】薬液投与装置は、生体内へ薬液を送液する送液部１００と、送液部による送液動作を制御する第１制御部２６０と、使用者の身体の動作に基づいた活動を検出する活動検出部６０と、送液部が生体内へ送液した薬液の送液量に関する既送液データを記憶する第２記憶部５１と、第２記憶部が記憶した既送液データおよび活動検出部が検出した活動に基づいて生体内における薬液の残存量を計算し、かつ、当該薬液の残存量に基づいて生体へ投与すべき薬液の送液予定量を計算する演算部２６１と、を有する。そして、第１制御部は、送液予定量の薬液が生体へ送液されるように送液部の送液動作を制御する。【選択図】図７
