A rotary compressor, comprising: a plurality of bearing plates (141, 142); a cylinder provided between the plurality of bearing plates to form a compression space; a rotating shaft including a shaft portion that penetrates through the plurality of bearing plates (141, 142), an eccentric portion that is accommodated in the compression space of the cylinder, a first oil supply hole formed in the shaft portion, and a second oil supply hole that penetrates from the first oil supply hole to an outer circumferential surface of the eccentric portion; a roller slidingly coupled to the eccentric portion of the rotating shaft and configured to be moved along an inner circumferential surface of the cylinder by the rotating shaft; and a vane slidingly coupled to the cylinder so as to divide the compression space into a plurality of compression chambers, wherein the outer circumferential surface of the eccentric portion or an inner circumferential surface of the roller that faces the outer circumferential surface of the eccentric portion is provided with an oil supply groove (135, 1351, 1352; 1442) formed along a circumferential direction to communicate with the second oil supply hole, and wherein the oil supply groove (135, 1351, 1352; 1442) is formed such that a depth of a portion thereof far away from the second oil supply hole is less than a depth of a portion thereof adjacent to the second oil supply hole, characterized in that: the oil supply groove (135, 1351, 1352; 1442) comprises: a first oil supply groove in which an end portion of the second oil supply hole is accommodated; and a second oil supply groove (1352; 1442) that extends from one end of the first oil supply groove in a rotation direction of the rotating shaft, wherein the second oil supply groove (1352; 1442) is eccentric to one direction along the circumferential direction with respect to the second oil supply hole, and wherein a circumferential length of the second oil supply groove (1352; 1442) is greater than a circumferential length of the first oil supply groove. a plurality of bearing plates (141, 142); a cylinder provided between the plurality of bearing plates to form a compression space; a rotating shaft including a shaft portion that penetrates through the plurality of bearing plates (141, 142), an eccentric portion that is accommodated in the compression space of the cylinder, a first oil supply hole formed in the shaft portion, and a second oil supply hole that penetrates from the first oil supply hole to an outer circumferential surface of the eccentric portion; a roller slidingly coupled to the eccentric portion of the rotating shaft and configured to be moved along an inner circumferential surface of the cylinder by the rotating shaft; and a vane slidingly coupled to the cylinder so as to divide the compression space into a plurality of compression chambers, wherein the outer circumferential surface of the eccentric portion or an inner circumferential surface of the roller that faces the outer circumferential surface of the eccentric portion is provided with an oil supply groove (135, 1351, 1352; 1442) formed along a circumferential direction to communicate with the second oil supply hole, and wherein the oil supply groove (135, 1351, 1352; 1442) is formed such that a depth of a portion thereof far away from the second oil supply hole is less than a depth of a portion thereof adjacent to the second oil supply hole, characterized in that: the oil supply groove (135, 1351, 1352; 1442) comprises: a first oil supply groove in which an end portion of the second oil supply hole is accommodated; and a second oil supply groove (1352; 1442) that extends from one end of the first oil supply groove in a rotation direction of the rotating shaft, wherein the second oil supply groove (1352; 1442) is eccentric to one direction along the circumferential direction with respect to the second oil supply hole, and wherein a circumferential length of the second oil supply groove (1352; 1442) is greater than a circumferential length of the first oil supply groove. a first oil supply groove in which an end portion of the second oil supply hole is accommodated; and a second oil supply groove (1352; 1442) that extends from one end of the first oil supply groove in a rotation direction of the rotating shaft, wherein the second oil supply groove (1352; 1442) is eccentric to one direction along the circumferential direction with respect to the second oil supply hole, and wherein a circumferential length of the second oil supply groove (1352; 1442) is greater than a circumferential length of the first oil supply groove.