A liquid medicine administration device for administration of a liquid medicine includes a liquid delivery unit; a control unit configured to control the liquid delivery unit; an activity detection unit; a storage unit configured to store data indicating an amount of the liquid medicine that has already been delivered into the living body; and a calculation unit configured to calculate a residual amount of the liquid medicine in the living body on the basis of (i) the data indicating the amount of the liquid medicine that has already been delivered by the liquid delivery unit into the living body, and (ii) the activity detected by the activity detection unit, and calculate a scheduled delivery amount of the liquid medicine to be administered into the living body on the basis of the residual amount of the liquid medicine.