A liquid sales management device is to be added to a liquid supply system supplying a liquid within a storage container to a dispensing device through a supply pipe with the liquid pressurized in order to cool the liquid in the dispensing device, and dispensing the cooled liquid to a drinking container. The liquid sales management device includes an actual flow rate determining unit that determines an actual measured flow rate of the liquid dispensed into the drinking container from the dispensing device, a cleaning mode detection unit that detects a cleaning mode in the liquid supply system, and a consumption flow rate acquisition unit that determines an actual consumption of the liquid based on the number of cycles of the cleaning mode, a known liquid amount consumed in one cycle of the cleaning mode in the liquid supply system, and the actual measured flow rate.