A scroll compressor comprising: a casing configured to include a discharge part for discharging a refrigerant on one side and a reservoir space for storing oil; a driver unit including a stator coupled to an inner circumferential surface of the casing and generating a rotating magnetic field, and a rotor accommodated in the stator and rotated by the rotating magnetic field; a rotation shaft coupled to the rotor and rotating together with the rotor; a compression unit coupled to the rotation shaft and lubricated with the oil, wherein the compression unit is provided to compress and discharge the refrigerant; and an oil-separator disposed between the discharge part and the driver unit for separating the oil from the refrigerant to be guided to the discharge part, wherein the oil-separator includes: a centrifugal separator rotating together with the rotation shaft to provide a centrifugal force for separating the oil from the refrigerant; and a coupler provided to rotate the centrifugal separator with the rotating shaft, characterized in that the coupler includes: a circumferential body extending from the centrifugal separator and receiving therein a fastening member for coupling the rotation shaft with the coupler; and a coupling body extending from an inner circumferential surface of the circumferential body and facing the rotation shaft wherein the centrifugal separator includes: a rotating body extending from the coupler to have a diameter larger than a diameter of the coupler; and an extended body extending from the rotating body toward the discharge part. a casing configured to include a discharge part for discharging a refrigerant on one side and a reservoir space for storing oil; a driver unit including a stator coupled to an inner circumferential surface of the casing and generating a rotating magnetic field, and a rotor accommodated in the stator and rotated by the rotating magnetic field; a rotation shaft coupled to the rotor and rotating together with the rotor; a compression unit coupled to the rotation shaft and lubricated with the oil, wherein the compression unit is provided to compress and discharge the refrigerant; and an oil-separator disposed between the discharge part and the driver unit for separating the oil from the refrigerant to be guided to the discharge part, wherein the oil-separator includes: a centrifugal separator rotating together with the rotation shaft to provide a centrifugal force for separating the oil from the refrigerant; and a coupler provided to rotate the centrifugal separator with the rotating shaft, characterized in that the coupler includes: a circumferential body extending from the centrifugal separator and receiving therein a fastening member for coupling the rotation shaft with the coupler; and a coupling body extending from an inner circumferential surface of the circumferential body and facing the rotation shaft wherein the centrifugal separator includes: a rotating body extending from the coupler to have a diameter larger than a diameter of the coupler; and an extended body extending from the rotating body toward the discharge part. a centrifugal separator rotating together with the rotation shaft to provide a centrifugal force for separating the oil from the refrigerant; and a coupler provided to rotate the centrifugal separator with the rotating shaft, characterized in that the coupler includes: a circumferential body extending from the centrifugal separator and receiving therein a fastening member for coupling the rotation shaft with the coupler; and a coupling body extending from an inner circumferential surface of the circumferential body and facing the rotation shaft wherein the centrifugal separator includes: a rotating body extending from the coupler to have a diameter larger than a diameter of the coupler; and an extended body extending from the rotating body toward the discharge part. a circumferential body extending from the centrifugal separator and receiving therein a fastening member for coupling the rotation shaft with the coupler; and a coupling body extending from an inner circumferential surface of the circumferential body and facing the rotation shaft wherein the centrifugal separator includes: a rotating body extending from the coupler to have a diameter larger than a diameter of the coupler; and an extended body extending from the rotating body toward the discharge part. a rotating body extending from the coupler to have a diameter larger than a diameter of the coupler; and an extended body extending from the rotating body toward the discharge part.