A compressor comprising: a case having an outlet configured to discharge a refrigerant at one side thereof; a rotation shaft disposed in the case ; a driver coupled to the case and configured to rotate the rotation shaft ; a compression unit coupled to the rotation shaft and configured to compress the refrigerant; and a muffler coupled to the compression unit and configured to provide an enclosed space for guiding the refrigerant to the outlet , wherein the compressor further comprises a branch protruding or recessed and extending from at least one of the compression unit and the muffler in a direction of the rotation shaft in the manner of expanding the enclosed space such that the branch is configured to reduce vibration or noise caused by the refrigerant discharged from the compression unit , wherein the muffler comprises: a muffler shaft support portion having an opening and coupled to the rotation shaft ; the compressor being characterised in that the muffler further comprises a collector protruding and extending from the muffler in a direction away from the rotation shaft and configured to guide the refrigerant to the outlet ; and a guider configured to guide the refrigerant collected by the collector to the outlet , and wherein the branch protrudes and extends from the collector in the direction away from the compression unit . a case having an outlet configured to discharge a refrigerant at one side thereof; a rotation shaft disposed in the case ; a driver coupled to the case and configured to rotate the rotation shaft ; a compression unit coupled to the rotation shaft and configured to compress the refrigerant; and a muffler coupled to the compression unit and configured to provide an enclosed space for guiding the refrigerant to the outlet , wherein the compressor further comprises a branch protruding or recessed and extending from at least one of the compression unit and the muffler in a direction of the rotation shaft in the manner of expanding the enclosed space such that the branch is configured to reduce vibration or noise caused by the refrigerant discharged from the compression unit , wherein the muffler comprises: a muffler shaft support portion having an opening and coupled to the rotation shaft ; the compressor being characterised in that the muffler further comprises a collector protruding and extending from the muffler in a direction away from the rotation shaft and configured to guide the refrigerant to the outlet ; and a guider configured to guide the refrigerant collected by the collector to the outlet , and wherein the branch protrudes and extends from the collector in the direction away from the compression unit . a muffler shaft support portion having an opening and coupled to the rotation shaft ; the compressor being characterised in that the muffler further comprises a collector protruding and extending from the muffler in a direction away from the rotation shaft and configured to guide the refrigerant to the outlet ; and a guider configured to guide the refrigerant collected by the collector to the outlet , and wherein the branch protrudes and extends from the collector in the direction away from the compression unit . <EOS>