An air-conditioning apparatus comprising: a refrigerant circuit through which heat source side refrigerant is circulated, the refrigerant circuit including a compressor, a heat source side heat exchanger, a plurality of expansion devices (16a,16b), refrigerant passages of a plurality of intermediate heat exchangers (15a,15b), and a plurality of refrigerant flow switching devices (11,18a,18b) which are connected by refrigerant pipes, the refrigerant flow switching devices switching between circulation paths; a heat medium circuit through which a heat medium is circulated, the heat medium circuit including a pump (21a,21b), a plurality of use side heat exchangers (26a-26d), a plurality of heat medium flow switching devices (22a-22d, 23a-23d), a plurality of heat medium flow control devices (25a-25d), and heat medium passages of the intermediate heat exchangers (15a,15b) which are connected by heat medium pipes; and actuation control means configured to perform control in such a manner that the heat medium flow switching device (22a-22d, 23a-23d) and the heat medium flow control device (25a-25d) connected to one of the use side heat exchangers (26a-26d) are opened, wherein the actuation control means has a function of controlling the pump (21a,21b) in such a manner that a start time of driving of the pump (21a,21b) is delayed later than start of actuation of the heat medium flow switching device (22a-22d, 23a-23d) and the heat medium flow control device (25a-25d) connected to the one of the use side heat exchangers (26a-26d), characterized in that, after that, the heat medium flow control device (25a-25d) connected to another one of the use side heat exchangers (26a-26d) is opened. a refrigerant circuit through which heat source side refrigerant is circulated, the refrigerant circuit including a compressor, a heat source side heat exchanger, a plurality of expansion devices (16a,16b), refrigerant passages of a plurality of intermediate heat exchangers (15a,15b), and a plurality of refrigerant flow switching devices (11,18a,18b) which are connected by refrigerant pipes, the refrigerant flow switching devices switching between circulation paths; a heat medium circuit through which a heat medium is circulated, the heat medium circuit including a pump (21a,21b), a plurality of use side heat exchangers (26a-26d), a plurality of heat medium flow switching devices (22a-22d, 23a-23d), a plurality of heat medium flow control devices (25a-25d), and heat medium passages of the intermediate heat exchangers (15a,15b) which are connected by heat medium pipes; and actuation control means configured to perform control in such a manner that the heat medium flow switching device (22a-22d, 23a-23d) and the heat medium flow control device (25a-25d) connected to one of the use side heat exchangers (26a-26d) are opened, wherein the actuation control means has a function of controlling the pump (21a,21b) in such a manner that a start time of driving of the pump (21a,21b) is delayed later than start of actuation of the heat medium flow switching device (22a-22d, 23a-23d) and the heat medium flow control device (25a-25d) connected to the one of the use side heat exchangers (26a-26d), characterized in that, after that, the heat medium flow control device (25a-25d) connected to another one of the use side heat exchangers (26a-26d) is opened.