Condenser state predicting device

There is provided a condenser state predicting device capable of recognizing operating condition-based state prediction information regarding the performance of a 5 condenser and the thickness reduction of its tubes. A condenser state predicting device 18 of an embodiment includes a display information generator 430 configured to generate at least one of: screen display information 300 to display performance information indicating performance of a condenser, the performance of the condenser being predicted based on measurement information that is measured or input information that is input; and screen 10 display information 302 to display residual thickness information indicating a residual ratio of the thickness of tubes 16P of the condenser 16, the residual ratio being predicted based on the input information.