A scroll compressor, comprising: a casing; an orbiting scroll provided with an orbiting wrap, the orbiting scroll being provided in an inner space of the casing to perform an orbiting motion; a non-orbiting scroll provided with a non-orbiting wrap provided at a first side thereof to form a compression chamber composed of a suction chamber, an intermediate pressure chamber, and a discharge chamber together with the orbiting wrap; a back pressure chamber assembly provided at a second side of the non-orbiting scroll to form a back pressure chamber for pressurizing the non-orbiting scroll toward the orbiting scroll direction; a first flow path communicating from the intermediate pressure chamber to an outside of the intermediate pressure chamber; characterised by: a second flow path communicating between the first flow path and an inner space of the casing; a first valve provided with a first surface to open and close between the first flow path and the second flow path; a third flow path (161g, 151d) provided in the back pressure chamber assembly or the non-orbiting scroll to flow refrigerant at a first pressure; a fourth flow path (161j, 151e) provided in the back pressure chamber assembly or the non-orbiting scroll to flow refrigerant of a second pressure lower than the first pressure; a fifth flow path (161h, 151f) provided in the back pressure chamber assembly or the non-orbiting scroll, wherein one end of the fifth flow path (161h, 151f) communicates with the third flow path (161g, 151d) and the fourth flow path (161j, 151f), and wherein the other end of the fifth flow path (161h, 151f) communicates with a second surface of the first valve; and a second valve provided at a point where the third flow path (161g, 151d), the fourth flow path (161j, 151f) and the fifth flow path (161h, 151f) meet, and configured to be moved between a first position and a second position, such that the third flow path (161g, 151d) is communicated with the fifth flow path (161h, 151f) at the first position to supply refrigerant of a first pressure toward a second surface of the first valve, and the fourth flow path (161j, 151f) is communicated with the fifth flow path (161h, 151f) at the second position to supply refrigerant of a second pressure toward a second surface of the first valve. a casing; an orbiting scroll provided with an orbiting wrap, the orbiting scroll being provided in an inner space of the casing to perform an orbiting motion; a non-orbiting scroll provided with a non-orbiting wrap provided at a first side thereof to form a compression chamber composed of a suction chamber, an intermediate pressure chamber, and a discharge chamber together with the orbiting wrap; a back pressure chamber assembly provided at a second side of the non-orbiting scroll to form a back pressure chamber for pressurizing the non-orbiting scroll toward the orbiting scroll direction; a first flow path communicating from the intermediate pressure chamber to an outside of the intermediate pressure chamber; a second flow path communicating between the first flow path and an inner space of the casing; a first valve provided with a first surface to open and close between the first flow path and the second flow path; a third flow path (161g, 151d) provided in the back pressure chamber assembly or the non-orbiting scroll to flow refrigerant at a first pressure; a fourth flow path (161j, 151e) provided in the back pressure chamber assembly or the non-orbiting scroll to flow refrigerant of a second pressure lower than the first pressure; a fifth flow path (161h, 151f) provided in the back pressure chamber assembly or the non-orbiting scroll, wherein one end of the fifth flow path (161h, 151f) communicates with the third flow path (161g, 151d) and the fourth flow path (161j, 151f), and wherein the other end of the fifth flow path (161h, 151f) communicates with a second surface of the first valve; and a second valve provided at a point where the third flow path (161g, 151d), the fourth flow path (161j, 151f) and the fifth flow path (161h, 151f) meet, and configured to be moved between a first position and a second position, such that the third flow path (161g, 151d) is communicated with the fifth flow path (161h, 151f) at the first position to supply refrigerant of a first pressure toward a second surface of the first valve, and the fourth flow path (161j, 151f) is communicated with the fifth flow path (161h, 151f) at the second position to supply refrigerant of a second pressure toward a second surface of the first valve.