A heat pump device comprising: a compressor including a first discharge passage for discharging refrigerant and first refrigerator oil, and a second discharge passage for discharging the refrigerant and second refrigerator oil having a mass flow rate lower than a mass flow rate of the first refrigerator oil; a first heat exchanger including one or a plurality of first refrigerant heat transfer channels through which the refrigerant and the first refrigerator oil discharged from the first discharge passage pass, and one or a plurality of first liquid heat transfer channels through which a liquid passes, heat exchange being performed between the first refrigerant heat transfer channel and the first liquid heat transfer channel; and a second heat exchanger including one or a plurality of second refrigerant heat transfer channels through which the refrigerant and the second refrigerator oil discharged from the second discharge passage pass, and one or a plurality of second liquid heat transfer channels through which the liquid passes, heat exchange being performed between the second refrigerant heat transfer channel and the second liquid heat transfer channel, characterized in that a total sectional area of the one or a plurality of first refrigerant heat transfer channels is larger than a total sectional area of the one or a plurality of second refrigerant heat transfer channels, whereby the total sectional area of the one or a plurality of first refrigerant heat transfer channels is a sum of sectional area of each of the first refrigerant heat transfer channels, and the total sectional area of the one or a plurality of second refrigerant heat transfer channels is a sum of sectional area of each of the second refrigerant heat transfer channels, whereby the sectional area is in a section perpendicular to a flow direction, the first refrigerant heat transfer channel is formed of a first refrigerant heat transfer pipe(42, 42a, 42b, 42c), the second refrigerant heat transfer channel is formed of a second refrigerant heat transfer pipe, the first liquid heat transfer channel is formed of a first twist pipe having a helical groove(411, 411a, 411b, 411c) in an outer periphery, the second liquid heat transfer channel is formed of a second twist pipe having a helical groove in an outer periphery, the first refrigerant heat transfer pipe(42, 42a, 42b, 42c) is located along the groove(411, 411a, 411b, 411c) in the first twist pipe, the second refrigerant heat transfer pipe is located along the groove in the second twist pipe, a twist pitch of the first twist pipe is larger than a twist pitch of the second twist pipe, wherein when p is a twist pitch of the first twist pipe and SRi is an inner diameter of the first twist pipe, p/SRi is not less than 1.1 and not more than 1.8. a compressor including a first discharge passage for discharging refrigerant and first refrigerator oil, and a second discharge passage for discharging the refrigerant and second refrigerator oil having a mass flow rate lower than a mass flow rate of the first refrigerator oil; a first heat exchanger including one or a plurality of first refrigerant heat transfer channels through which the refrigerant and the first refrigerator oil discharged from the first discharge passage pass, and one or a plurality of first liquid heat transfer channels through which a liquid passes, heat exchange being performed between the first refrigerant heat transfer channel and the first liquid heat transfer channel; and a second heat exchanger including one or a plurality of second refrigerant heat transfer channels through which the refrigerant and the second refrigerator oil discharged from the second discharge passage pass, and one or a plurality of second liquid heat transfer channels through which the liquid passes, heat exchange being performed between the second refrigerant heat transfer channel and the second liquid heat transfer channel, characterized in that a total sectional area of the one or a plurality of first refrigerant heat transfer channels is larger than a total sectional area of the one or a plurality of second refrigerant heat transfer channels, whereby the total sectional area of the one or a plurality of first refrigerant heat transfer channels is a sum of sectional area of each of the first refrigerant heat transfer channels, and the total sectional area of the one or a plurality of second refrigerant heat transfer channels is a sum of sectional area of each of the second refrigerant heat transfer channels, whereby the sectional area is in a section perpendicular to a flow direction, the first refrigerant heat transfer channel is formed of a first refrigerant heat transfer pipe(42, 42a, 42b, 42c), the second refrigerant heat transfer channel is formed of a second refrigerant heat transfer pipe, the first liquid heat transfer channel is formed of a first twist pipe having a helical groove(411, 411a, 411b, 411c) in an outer periphery, the second liquid heat transfer channel is formed of a second twist pipe having a helical groove in an outer periphery, the first refrigerant heat transfer pipe(42, 42a, 42b, 42c) is located along the groove(411, 411a, 411b, 411c) in the first twist pipe, the second refrigerant heat transfer pipe is located along the groove in the second twist pipe, a twist pitch of the first twist pipe is larger than a twist pitch of the second twist pipe, wherein when p is a twist pitch of the first twist pipe and SRi is an inner diameter of the first twist pipe, p/SRi is not less than 1.1 and not more than 1.8.