A hot water supply device with a heat pump, the hot water supply device comprising: a main refrigerant circuit comprising a compressor, an indoor heat exchanger, an expander, and an outdoor heat exchanger to form a refrigerant cycle; and a hot water supply heat exchanger connected to the main refrigerant circuit to perform hot water supply using a high-temperature refrigerant discharged from the compressor; a cooling/heating switch part installed at an outlet side of the compressor to change a flow direction of refrigerant received from the compressor toward one of the indoor heat exchanger or the outdoor heat exchanger; and a compressor discharge pipe connected to an outlet of the compressor to extend to an inlet of a flow rate adjustment part (23, 231, 232), wherein the hot water supply device further comprises: a hot water inflow side pipe branched from the compressor discharge pipe to connect to the hot water supply heat exchanger; a hot water discharge side pipe connected with the hot water supply heat exchanger; a cooling/heating side flow rate adjustment part installed at the compressor discharge pipe, the cooling/heating side flow rate adjustment part being openable to adjust the amount of the refrigerant flowing through the compressor discharge pipe; a hot water supply side flowrate adjustment part installed at the hot water inflow side pipe, the hot water supply side flowrate adjustment part being openable to adjust the amount of the refrigerant flowing through the hot water inflow pipe; and a controller configured to control open degree of the cooling/heating side flow rate adjustment part and the hot water supply side flowrate adjustment part, and wherein refrigerant passing through the hot water supply heat exchanger is condensed and is additionally condensed through one of the indoor heat exchanger and the outdoor heat exchanger, wherein when a hot water supply load exceeds a cooling/heating load, the controller controls the cooling/heating side flow rate adjustment part and the hot water supply side flowrate adjustment part such that at least one of a decrease of the open degree of the cooling/heating side flow rate adjustment part or an increase of the open degree of the hot water supply side flowrate adjustment part is performed while the hot water supply and cooling/heating operations are performed, the hot water supply device further comprising: an indoor side guide pipe guiding a refrigerant flowing in the hot water discharge side pipe into the indoor heat exchanger; an outdoor side guide pipe guiding the refrigerant flowing in the hot water discharge side pipe into the outdoor heat exchanger; and a hot water supply side flow switch part connected to the hot water discharge side pipe, the indoor side guide pipe and the outdoor side guide pipe and selectively switching a flow direction of the refrigerant flowing in the hot water discharge side pipe into one of the indoor side guide pipe and the outdoor side guide pipe. a main refrigerant circuit comprising a compressor, an indoor heat exchanger, an expander, and an outdoor heat exchanger to form a refrigerant cycle; and a hot water supply heat exchanger connected to the main refrigerant circuit to perform hot water supply using a high-temperature refrigerant discharged from the compressor; a cooling/heating switch part installed at an outlet side of the compressor to change a flow direction of refrigerant received from the compressor toward one of the indoor heat exchanger or the outdoor heat exchanger; and a compressor discharge pipe connected to an outlet of the compressor to extend to an inlet of a flow rate adjustment part (23, 231, 232), wherein a hot water inflow side pipe branched from the compressor discharge pipe to connect to the hot water supply heat exchanger; a hot water discharge side pipe connected with the hot water supply heat exchanger; a cooling/heating side flow rate adjustment part installed at the compressor discharge pipe, the cooling/heating side flow rate adjustment part being openable to adjust the amount of the refrigerant flowing through the compressor discharge pipe; a hot water supply side flowrate adjustment part installed at the hot water inflow side pipe, the hot water supply side flowrate adjustment part being openable to adjust the amount of the refrigerant flowing through the hot water inflow pipe; and a controller configured to control open degree of the cooling/heating side flow rate adjustment part and the hot water supply side flowrate adjustment part, and an indoor side guide pipe guiding a refrigerant flowing in the hot water discharge side pipe into the indoor heat exchanger; an outdoor side guide pipe guiding the refrigerant flowing in the hot water discharge side pipe into the outdoor heat exchanger; and a hot water supply side flow switch part connected to the hot water discharge side pipe, the indoor side guide pipe and the outdoor side guide pipe and selectively switching a flow direction of the refrigerant flowing in the hot water discharge side pipe into one of the indoor side guide pipe and the outdoor side guide pipe.