To provide a heat pump type hot-water supply apparatus which estimates an amount of hot water remaining in a hot-water storage tank during a water stoppage state due to disaster or the like.

When water is stopped upon power fail recovery, a boiling operation for boiling hot water inside the hot-water storage tank 2 is started and the boiling operation is finished after a predetermined time has elapsed. In this case, temperatures detected by hot-water storage temperature sensors 43 provided in a vertical direction of the hot-water storage tank 2 are compared with each other. Because it is determined that hot water remains in up to a location where the hot-water storage temperature sensor 43 which detects a maximum temperature is provided and a remaining amount is displayed at a display unit 49 of a remote controller 48, even if hot water within the hot-water storage tank 2 is taken out as daily life water during power outage and water stoppage, an amount of hot water remaining in the hot-water storage tank 2 can be known upon power fail recovery, so that usability is improved.