A rotary compressor, comprising: a casing; a cylinder fixed to an inner space of the casing to define a compression space; a main bearing and a sub bearing respectively disposed on both sides of the cylinder in an axial direction; a rotating shaft inserted through the cylinder to be supported on the main bearing and the sub bearing; a roller disposed on the rotating shaft, having an outer circumferential surface that is eccentric with respect to an inner circumferential surface of the cylinder, and provided with at least one vane slot (1346a, 1346b, 1346c) open toward the outer circumferential surface; and a vane (1351, 1352, 1353) slidably inserted into the vane slot (1346a, 1346b, 1346c), a front surface of the vane (1351, 1352, 1353) coming in contact with the inner circumferential surface of the cylinder to partition the compression space into a plurality of compression chambers (V1, V2, V3), wherein the roller comprises: a roller body having a spring insertion groove (1348a, 1348b, 1348c) formed in an inner end portion of the vane slot (1346a, 1346b, 1346c) in a slot direction; and a vane spring (1342a, 1342b, 1342c) inserted into the spring insertion groove (1348a, 1348b, 1348c) to support a rear surface of the vane (1351, 1352, 1353) toward the inner circumferential surface of the cylinder, characterized in that a plurality of back pressure pockets (1315a, 1315b, 1325a, 1325b) each having different pressure are formed to be spaced apart from each other in a circumferential direction in at least one of a sliding surface of the main bearing facing one axial side surface of the roller and a sliding surface of the sub bearing facing another axial side surface of the roller, and wherein each of the plurality of back pressure pockets (1315a, 1315b, 1325a, 1325b) is formed to overlap the spring insertion groove (1348a, 1348b, 1348c) in the axial direction. a casing; a cylinder fixed to an inner space of the casing to define a compression space; a main bearing and a sub bearing respectively disposed on both sides of the cylinder in an axial direction; a rotating shaft inserted through the cylinder to be supported on the main bearing and the sub bearing; a roller disposed on the rotating shaft, having an outer circumferential surface that is eccentric with respect to an inner circumferential surface of the cylinder, and provided with at least one vane slot (1346a, 1346b, 1346c) open toward the outer circumferential surface; and a vane (1351, 1352, 1353) slidably inserted into the vane slot (1346a, 1346b, 1346c), a front surface of the vane (1351, 1352, 1353) coming in contact with the inner circumferential surface of the cylinder to partition the compression space into a plurality of compression chambers (V1, V2, V3), wherein the roller comprises: a roller body having a spring insertion groove (1348a, 1348b, 1348c) formed in an inner end portion of the vane slot (1346a, 1346b, 1346c) in a slot direction; and a vane spring (1342a, 1342b, 1342c) inserted into the spring insertion groove (1348a, 1348b, 1348c) to support a rear surface of the vane (1351, 1352, 1353) toward the inner circumferential surface of the cylinder, characterized in that a plurality of back pressure pockets (1315a, 1315b, 1325a, 1325b) each having different pressure are formed to be spaced apart from each other in a circumferential direction in at least one of a sliding surface of the main bearing facing one axial side surface of the roller and a sliding surface of the sub bearing facing another axial side surface of the roller, and wherein each of the plurality of back pressure pockets (1315a, 1315b, 1325a, 1325b) is formed to overlap the spring insertion groove (1348a, 1348b, 1348c) in the axial direction. a roller body having a spring insertion groove (1348a, 1348b, 1348c) formed in an inner end portion of the vane slot (1346a, 1346b, 1346c) in a slot direction; and a vane spring (1342a, 1342b, 1342c) inserted into the spring insertion groove (1348a, 1348b, 1348c) to support a rear surface of the vane (1351, 1352, 1353) toward the inner circumferential surface of the cylinder, characterized in that a plurality of back pressure pockets (1315a, 1315b, 1325a, 1325b) each having different pressure are formed to be spaced apart from each other in a circumferential direction in at least one of a sliding surface of the main bearing facing one axial side surface of the roller and a sliding surface of the sub bearing facing another axial side surface of the roller, and wherein each of the plurality of back pressure pockets (1315a, 1315b, 1325a, 1325b) is formed to overlap the spring insertion groove (1348a, 1348b, 1348c) in the axial direction.