A scroll compressor, comprising: a casing having an inner space sealed; a main frame provided in the inner space of the casing ; a fixed scroll having a fixed end plate coupled to the main frame , a fixed wrap formed on one side surface of the fixed end plate , and a discharge port formed through the fixed end plate at one side of the fixed wrap ; an orbiting scroll having an orbiting end plate located between the main frame and the fixed scroll , and an orbiting wrap formed on one side surface of the orbiting end plate so as to define a compression chamber (V) in engagement with the fixed wrap ; a discharge cover provided with a discharge space (S4) to accommodate the discharge port and coupled to another side surface of the fixed end plate ; a refrigerant suction pipe coupled to the discharge cover through the casing in a radial direction; a suction passage communicating between the refrigerant suction pipe and the compression chamber (V); and a suction passage opening and closing valve provided inside the suction passage so as to selectively open or close the suction passage , wherein the suction passage comprises a first suction passage formed in the discharge cover to be connected the refrigerant suction pipe ; and a second suction passage formed in the fixed scroll and having one end communicating with the first suction passage , characterized in that the second suction passage has another end communicating with a suction chamber (Vs) formed at an outer side of the compression chamber (V), and the suction passage opening and closing valve is disposed slidable in the second suction passage in the axial direction. a casing having an inner space sealed; a main frame provided in the inner space of the casing ; a fixed scroll having a fixed end plate coupled to the main frame , a fixed wrap formed on one side surface of the fixed end plate , and a discharge port formed through the fixed end plate at one side of the fixed wrap ; an orbiting scroll having an orbiting end plate located between the main frame and the fixed scroll , and an orbiting wrap formed on one side surface of the orbiting end plate so as to define a compression chamber (V) in engagement with the fixed wrap ; a discharge cover provided with a discharge space (S4) to accommodate the discharge port and coupled to another side surface of the fixed end plate ; a refrigerant suction pipe coupled to the discharge cover through the casing in a radial direction; a suction passage communicating between the refrigerant suction pipe and the compression chamber (V); and a suction passage opening and closing valve provided inside the suction passage so as to selectively open or close the suction passage , wherein the suction passage comprises a first suction passage formed in the discharge cover to be connected the refrigerant suction pipe ; and a second suction passage formed in the fixed scroll and having one end communicating with the first suction passage , characterized in that the second suction passage has another end communicating with a suction chamber (Vs) formed at an outer side of the compression chamber (V), and the suction passage opening and closing valve is disposed slidable in the second suction passage in the axial direction. <EOS>