An integrated air-conditioning and hot-water-supply system includes a compressor, a plate-type water heat exchanger, a hot-water-supply pressure-reducing mechanism, and an outdoor heat exchanger. Moreover, the integrated air-conditioning and hot-water-supply system includes a high-pressure sensor that detects a high pressure in the compressor, and a controller that calculates a condensing temperature of the plate-type water heat exchanger based on the high pressure detected by the high-pressure sensor. When the calculated condensing temperature is higher than or equal to a preset target condensing-temperature value, the controller performs condensing-temperature control for controlling the operating frequency of the compressor based on a difference between the calculated condensing temperature and the target condensing-temperature value, and performs opening-degree control for controlling the opening degree of the hot-water-supply pressure-reducing mechanism concurrently with the condensing-temperature control based on a difference between a current opening degree of the hot-water-supply pressure-reducing mechanism and a preset target opening-degree value.