An air-conditioning apparatus includes a plurality of intermediate heat exchangers performing the same function (as a condenser or an evaporator) and allows each intermediate heat exchanger to exchange heat between a refrigerant heated or cooled in a refrigeration cycle on a heat source side and a heat medium flowing through a heat medium circuit on a use side such that heat energy produced on the heat source side is transmitted to use side heat exchangers. A controller calculates the difference between a heat medium inlet temperature and a heat medium outlet temperature Two of the use side heat exchanger which is operating to obtain a heat medium temperature difference for the use side heat exchanger, and controls a heat medium flow control device such that the heat medium temperature difference reaches a target heat medium temperature difference.