An air-conditioning hot-water supply complex system, comprising; a refrigeration cycle for air-conditioning having a first refrigerant circuit, in which a compressor for air-conditioning, flow path switching means, an outdoor heat exchanger, an indoor heat exchanger, and throttle means for air-conditioning are connected in series, in which a refrigerant-refrigerant heat exchanger and a throttle means for a hot-water supply heat source are connected in series and are connected with the indoor heat exchanger and the throttle means for air-conditioning in parallel, and in which a refrigerant for air-conditioning circulates; a refrigeration cycle for hot-water supply (2,2a) having a second refrigerant circuit, in which a compressor for hot-water supply, a heating medium-refrigerant heat exchanger, throttle means for hot-water supply, and the refrigerant-refrigerant heat exchanger are connected in series, and in which a refrigerant for hot-water supply circulates; a hot water supply load having a water circuit, in which a pump for water circulation, the heating medium-refrigerant heat exchanger, and a hot-water storage tank are connected in series, and in which water for hot-water supply circulates; wherein the refrigeration cycle for air-conditioning and the refrigeration cycle for hot-water supply (2,2a) are cascaded so that the refrigerant for air-conditioning and the refrigerant for hot-water supply performs heat exchange in the refrigerant-refrigerant heat exchanger, the refrigeration cycle for hot-water supply (2,2a) and the hot-water supply load are cascaded so that the refrigerant for hot-water supply and the water perform heat exchange in the heating medium-refrigerant heat exchanger, characterized in that a bypass pipe with a bypass electromagnetic valve is provided in parallel with the heating medium-refrigerant heat exchanger between a gateway of refrigerant piping connected with the heating medium-refrigerant heat exchanger, and an inflow amount of the refrigerant for hot-water supply to the heating medium-refrigerant heat exchanger is controlled by flowing the refrigerant for hot-water supply into the bypass pipe by opening and closing of the bypass electromagnetic valve, and in that in the piping for hot-water storage water circulation flowing the water for hot-water supply, a trap is formed, the trap being laid at a position where part of an outlet side of the heating medium-refrigerant heat exchanger is higher than an inlet side of the heating medium-refrigerant heat exchanger. a refrigeration cycle for air-conditioning having a first refrigerant circuit, in which a compressor for air-conditioning, flow path switching means, an outdoor heat exchanger, an indoor heat exchanger, and throttle means for air-conditioning are connected in series, in which a refrigerant-refrigerant heat exchanger and a throttle means for a hot-water supply heat source are connected in series and are connected with the indoor heat exchanger and the throttle means for air-conditioning in parallel, and in which a refrigerant for air-conditioning circulates; a refrigeration cycle for hot-water supply (2,2a) having a second refrigerant circuit, in which a compressor for hot-water supply, a heating medium-refrigerant heat exchanger, throttle means for hot-water supply, and the refrigerant-refrigerant heat exchanger are connected in series, and in which a refrigerant for hot-water supply circulates; a hot water supply load having a water circuit, in which a pump for water circulation, the heating medium-refrigerant heat exchanger, and a hot-water storage tank are connected in series, and in which water for hot-water supply circulates; wherein the refrigeration cycle for air-conditioning and the refrigeration cycle for hot-water supply (2,2a) are cascaded so that the refrigerant for air-conditioning and the refrigerant for hot-water supply performs heat exchange in the refrigerant-refrigerant heat exchanger, the refrigeration cycle for hot-water supply (2,2a) and the hot-water supply load are cascaded so that the refrigerant for hot-water supply and the water perform heat exchange in the heating medium-refrigerant heat exchanger, characterized in that a bypass pipe with a bypass electromagnetic valve is provided in parallel with the heating medium-refrigerant heat exchanger between a gateway of refrigerant piping connected with the heating medium-refrigerant heat exchanger, and an inflow amount of the refrigerant for hot-water supply to the heating medium-refrigerant heat exchanger is controlled by flowing the refrigerant for hot-water supply into the bypass pipe by opening and closing of the bypass electromagnetic valve, and in that in the piping for hot-water storage water circulation flowing the water for hot-water supply, a trap is formed, the trap being laid at a position where part of an outlet side of the heating medium-refrigerant heat exchanger is higher than an inlet side of the heating medium-refrigerant heat exchanger.