An air-conditioning device , comprising: a refrigerant circuit including a compressor , a heat source-side heat exchanger , an expansion unit , and an intermediate heat exchanger that are connected by a refrigerant pipe , and through which refrigerant circulates, the heat source-side heat exchanger exchanging heat between air and the refrigerant, the intermediate heat exchanger exchanging heat between the refrigerant and heat medium; a heat medium circuit including a pump , the intermediate heat exchanger , and a load-side heat exchanger that are connected by a heat medium pipe , and through which the heat medium circulates, the load-side heat exchanger exchanging heat between air in an air-conditioned space and the heat medium; a discharge unit connected downstream of the intermediate heat exchanger in the heat medium circuit and configured to discharge fluid flowing through the heat medium pipe , to outside of the heat medium pipe , depending on pressure of the fluid; a refrigerant detection device configured to detect concentration of the refrigerant contained in the fluid discharged from the discharge unit ; a notification device configured to notify leakage of the refrigerant; and controller configured to activate the notification device depending on the concentration of the refrigerant detected by the refrigerant detection device , characterised in that in a case where the concentration of the refrigerant detected by the refrigerant detection device exceeds a first stop set value that is a preset threshold of refrigerant concentration, the controller being configured to stop the pump , in a case where, after a set time elapses, the concentration of the refrigerant detected by the refrigerant detection device is lower than or equal to a reoperation set value that is a preset threshold of refrigerant concentration, the controller being configured to activate the stopped pump . a refrigerant circuit including a compressor , a heat source-side heat exchanger , an expansion unit , and an intermediate heat exchanger that are connected by a refrigerant pipe , and through which refrigerant circulates, the heat source-side heat exchanger exchanging heat between air and the refrigerant, the intermediate heat exchanger exchanging heat between the refrigerant and heat medium; a heat medium circuit including a pump , the intermediate heat exchanger , and a load-side heat exchanger that are connected by a heat medium pipe , and through which the heat medium circulates, the load-side heat exchanger exchanging heat between air in an air-conditioned space and the heat medium; a discharge unit connected downstream of the intermediate heat exchanger in the heat medium circuit and configured to discharge fluid flowing through the heat medium pipe , to outside of the heat medium pipe , depending on pressure of the fluid; a refrigerant detection device configured to detect concentration of the refrigerant contained in the fluid discharged from the discharge unit ; a notification device configured to notify leakage of the refrigerant; and controller configured to activate the notification device depending on the concentration of the refrigerant detected by the refrigerant detection device , characterised in that in a case where the concentration of the refrigerant detected by the refrigerant detection device exceeds a first stop set value that is a preset threshold of refrigerant concentration, the controller being configured to stop the pump , in a case where, after a set time elapses, the concentration of the refrigerant detected by the refrigerant detection device is lower than or equal to a reoperation set value that is a preset threshold of refrigerant concentration, the controller being configured to activate the stopped pump . <EOS>