A scroll compressor, comprising: a casing having a hermetic inner space divided into a low pressure portion and a high pressure portion; an orbiting scroll disposed within the inner space of the casing and performing an orbiting motion; a non-orbiting scroll forming a compression chamber together with the orbiting scroll, the compression chamber having a suction chamber, an intermediate pressure chamber and a discharge chamber; a back pressure chamber assembly coupled to the non-orbiting scroll to form a back pressure chamber; a bypass hole formed through the intermediate pressure chamber; and a check valve provided on the bypass hole to open and close the bypass hole, characterized in that the compressor further comprises: a valve accommodation groove formed on at least one of the non-orbiting scroll or the back pressure chamber assembly to accommodate the check valve therein; a communication passage communicating the valve accommodation groove and the low pressure portion of the casing with each other; a first valve assembly provided on the back pressure chamber assembly or the non-orbiting scroll to selectively open and close the communication passage; and a second valve assembly provided within the casing and connected to the first valve assembly, the second valve assembly controlling an opening/closing operation of the first valve assembly such that the first valve assembly opens and closes the communication passage. a casing having a hermetic inner space divided into a low pressure portion and a high pressure portion; an orbiting scroll disposed within the inner space of the casing and performing an orbiting motion; a non-orbiting scroll forming a compression chamber together with the orbiting scroll, the compression chamber having a suction chamber, an intermediate pressure chamber and a discharge chamber; a back pressure chamber assembly coupled to the non-orbiting scroll to form a back pressure chamber; a bypass hole formed through the intermediate pressure chamber; and a check valve provided on the bypass hole to open and close the bypass hole, characterized in that the compressor further comprises: a valve accommodation groove formed on at least one of the non-orbiting scroll or the back pressure chamber assembly to accommodate the check valve therein; a communication passage communicating the valve accommodation groove and the low pressure portion of the casing with each other; a first valve assembly provided on the back pressure chamber assembly or the non-orbiting scroll to selectively open and close the communication passage; and a second valve assembly provided within the casing and connected to the first valve assembly, the second valve assembly controlling an opening/closing operation of the first valve assembly such that the first valve assembly opens and closes the communication passage. a valve accommodation groove formed on at least one of the non-orbiting scroll or the back pressure chamber assembly to accommodate the check valve therein; a communication passage communicating the valve accommodation groove and the low pressure portion of the casing with each other; a first valve assembly provided on the back pressure chamber assembly or the non-orbiting scroll to selectively open and close the communication passage; and a second valve assembly provided within the casing and connected to the first valve assembly, the second valve assembly controlling an opening/closing operation of the first valve assembly such that the first valve assembly opens and closes the communication passage.