A scroll compressor, comprising: a casing; a discharge cover, the discharge cover dividing an inner surface of the casing into a suction space and a discharge space; a main frame, the main frame being formed spaced apart from the discharge cover; a first scroll supported by the main frame, the first scroll configured to perform an orbital motion with respect to a rotational shaft thereof in operation; a second scroll that forms a suction chamber, an intermediate pressure chamber, and a discharge chamber together with the first scroll, the second scroll being movable with respect to the first scroll and the second scroll comprising a discharge opening through which an operation fluid is discharged; characterized by a back pressure chamber assembly coupled to the second scroll, the back pressure chamber assembly comprising a back pressure plate having a back pressure chamber and a floating plate movably disposed in the back pressure chamber, the back pressure chamber assembly being configured to press the second scroll toward the first scroll, the back pressure chamber assembly further comprising at least one back pressure discharge opening (152a; 200) that communicates with the back pressure chamber; a discharge path by which the discharge chamber and the discharge space communicate with each other, wherein a back pressure discharge path (149, 149a, 158e; 200) is provided between the back pressure discharge opening (152a; 200) and the discharge path; and a check valve (124; 202) that prevents the operation fluid from being introduced into the back pressure chamber, the check valve (124; 202) being disposed at the back pressure discharge opening (152a; 200). a casing; a discharge cover, the discharge cover dividing an inner surface of the casing into a suction space and a discharge space; a main frame, the main frame being formed spaced apart from the discharge cover; a first scroll supported by the main frame, the first scroll configured to perform an orbital motion with respect to a rotational shaft thereof in operation; a second scroll that forms a suction chamber, an intermediate pressure chamber, and a discharge chamber together with the first scroll, the second scroll being movable with respect to the first scroll and the second scroll comprising a discharge opening through which an operation fluid is discharged; a back pressure chamber assembly coupled to the second scroll, the back pressure chamber assembly comprising a back pressure plate having a back pressure chamber and a floating plate movably disposed in the back pressure chamber, the back pressure chamber assembly being configured to press the second scroll toward the first scroll, the back pressure chamber assembly further comprising at least one back pressure discharge opening (152a; 200) that communicates with the back pressure chamber; a discharge path by which the discharge chamber and the discharge space communicate with each other, wherein a back pressure discharge path (149, 149a, 158e; 200) is provided between the back pressure discharge opening (152a; 200) and the discharge path; and a check valve (124; 202) that prevents the operation fluid from being introduced into the back pressure chamber, the check valve (124; 202) being disposed at the back pressure discharge opening (152a; 200).