A scroll compressor, comprising: a casing; a drive motor provided in an inner space of the casing; a first scroll disposed in an inner space of the casing and coupled to a rotation shaft that transmits a rotational force of the drive motor to perform an orbiting motion; a second scroll engaged with the first scroll to form a compression chamber composed of a suction chamber, an intermediate pressure chamber, and a discharge chamber; a back pressure chamber assembly provided on a rear surface of the second scroll to form a back pressure chamber so as to pressurize the second scroll in the first scroll direction; a plurality of bypass holes provided between the compression chamber and an internal space of the casing to bypass refrigerant sucked into the compression chamber to the internal space of the casing so as to vary a compression capacity of the compression chamber; a plurality of first valves provided in the second scroll or the back pressure chamber assembly to selectively open and close the bypass holes, respectively, according to an operation mode of the compressor; a plurality of back pressure holes (151a, 161f) provided between the compression chamber and the back pressure chamber to guide part of refrigerant compressed in the compression chamber to the back pressure chamber; and characterised in that the plurality of back pressure holes (151a, 161f) comprises a first back pressure hole (151a1, 161f1) and a second back pressure hole (151a2, 161f2), and the second back pressure hole (151a2, 161f2) is formed to communicate with a compression chamber having a higher pressure than the first back pressure hole (151a1, 161f1), wherein the first back pressure hole (151a1, 161f1) communicates with the back pressure chamber when the operation mode of the compressor is a power operation, and the second back pressure hole (151a2, 161f2) communicates with the back pressure chamber when the operation mode of the compressor is a saving operation, wherein the scroll compressor further comprises a plurality of second valves (158a, 158b) provided in the second scroll or the back pressure chamber assembly to selectively open and close the back pressure holes (151a, 161f) according to an operation mode of the scroll compressor. a casing; a drive motor provided in an inner space of the casing; a first scroll disposed in an inner space of the casing and coupled to a rotation shaft that transmits a rotational force of the drive motor to perform an orbiting motion; a second scroll engaged with the first scroll to form a compression chamber composed of a suction chamber, an intermediate pressure chamber, and a discharge chamber; a back pressure chamber assembly provided on a rear surface of the second scroll to form a back pressure chamber so as to pressurize the second scroll in the first scroll direction; a plurality of bypass holes provided between the compression chamber and an internal space of the casing to bypass refrigerant sucked into the compression chamber to the internal space of the casing so as to vary a compression capacity of the compression chamber; a plurality of first valves provided in the second scroll or the back pressure chamber assembly to selectively open and close the bypass holes, respectively, according to an operation mode of the compressor; a plurality of back pressure holes (151a, 161f) provided between the compression chamber and the back pressure chamber to guide part of refrigerant compressed in the compression chamber to the back pressure chamber; and characterised in that the plurality of back pressure holes (151a, 161f) comprises a first back pressure hole (151a1, 161f1) and a second back pressure hole (151a2, 161f2), and the second back pressure hole (151a2, 161f2) is formed to communicate with a compression chamber having a higher pressure than the first back pressure hole (151a1, 161f1), wherein the first back pressure hole (151a1, 161f1) communicates with the back pressure chamber when the operation mode of the compressor is a power operation, and the second back pressure hole (151a2, 161f2) communicates with the back pressure chamber when the operation mode of the compressor is a saving operation, wherein the scroll compressor further comprises a plurality of second valves (158a, 158b) provided in the second scroll or the back pressure chamber assembly to selectively open and close the back pressure holes (151a, 161f) according to an operation mode of the scroll compressor.