A scroll compressor comprising: a casing (110, 210); a main frame (130, 230) provided inside the casing (110, 210); a rotating shaft (125, 225) supported on the main frame (130, 230); an orbiting scroll (150, 250) coupled to the rotating shaft (125, 225) and supported by the main frame (130, 230); a fixed scroll (140, 240) fixed to the main frame (130, 230) and engaged with the orbiting scroll to form a compression chamber; and an Oldham ring (170, 270, 370, 470, 570), slidably coupled to the orbiting scroll (150, 250) to prevent rotation of the orbiting scroll (140, 240), wherein the Oldham ring includes: a ring body (173, 273, 373, 473, 573, 673, 773, 873) having an annular shape and provided between the main frame and the orbiting scroll (150, 250) to be supported in an axial direction of the rotating shaft; and a key portion extending in the axial direction from the ring body (173, 273, 373, 473, 573) and slidably inserted into a key accommodating portion provided in the orbiting scroll (150, 250), the main frame (130, 230), or the fixed scroll (140, 240), wherein the ring body or the key portion includes an oil supply passage for guiding oil accumulated in a member on which the ring body is supported to a gap between the key portion and the key accommodating portion, wherein the oil supply passage comprises an oil supply groove (171a, 575a) formed in at least one side surface of the key portion, wherein the oil supply groove (171a, 575a) has a multi-stage structure in which a plurality of oil supply grooves are spaced apart from each other on each of both sides of the key portion opposite to each other in a rotational direction of the rotating shaft, characterized in that the oil supply grooves (171a-2, 575a-2) disposed at a front side of the key portion with respect to a rotational direction of the rotating shaft have a greater number or greater width than the oil supply grooves (171a-3, 575a-3) disposed at a rear side of the key portion with respect to the rotational direction of the rotating shaft. a casing (110, 210); a main frame (130, 230) provided inside the casing (110, 210); a rotating shaft (125, 225) supported on the main frame (130, 230); an orbiting scroll (150, 250) coupled to the rotating shaft (125, 225) and supported by the main frame (130, 230); a fixed scroll (140, 240) fixed to the main frame (130, 230) and engaged with the orbiting scroll to form a compression chamber; and an Oldham ring (170, 270, 370, 470, 570), slidably coupled to the orbiting scroll (150, 250) to prevent rotation of the orbiting scroll (140, 240), wherein the Oldham ring includes: a ring body (173, 273, 373, 473, 573, 673, 773, 873) having an annular shape and provided between the main frame and the orbiting scroll (150, 250) to be supported in an axial direction of the rotating shaft; and a key portion extending in the axial direction from the ring body (173, 273, 373, 473, 573) and slidably inserted into a key accommodating portion provided in the orbiting scroll (150, 250), the main frame (130, 230), or the fixed scroll (140, 240), wherein the ring body or the key portion includes an oil supply passage for guiding oil accumulated in a member on which the ring body is supported to a gap between the key portion and the key accommodating portion, wherein the oil supply passage comprises an oil supply groove (171a, 575a) formed in at least one side surface of the key portion, wherein the oil supply groove (171a, 575a) has a multi-stage structure in which a plurality of oil supply grooves are spaced apart from each other on each of both sides of the key portion opposite to each other in a rotational direction of the rotating shaft, characterized in that the oil supply grooves (171a-2, 575a-2) disposed at a front side of the key portion with respect to a rotational direction of the rotating shaft have a greater number or greater width than the oil supply grooves (171a-3, 575a-3) disposed at a rear side of the key portion with respect to the rotational direction of the rotating shaft. a ring body (173, 273, 373, 473, 573, 673, 773, 873) having an annular shape and provided between the main frame and the orbiting scroll (150, 250) to be supported in an axial direction of the rotating shaft; and a key portion extending in the axial direction from the ring body (173, 273, 373, 473, 573) and slidably inserted into a key accommodating portion provided in the orbiting scroll (150, 250), the main frame (130, 230), or the fixed scroll (140, 240), wherein the ring body or the key portion includes an oil supply passage for guiding oil accumulated in a member on which the ring body is supported to a gap between the key portion and the key accommodating portion, wherein the oil supply passage comprises an oil supply groove (171a, 575a) formed in at least one side surface of the key portion, wherein the oil supply groove (171a, 575a) has a multi-stage structure in which a plurality of oil supply grooves are spaced apart from each other on each of both sides of the key portion opposite to each other in a rotational direction of the rotating shaft, characterized in that the oil supply grooves (171a-2, 575a-2) disposed at a front side of the key portion with respect to a rotational direction of the rotating shaft have a greater number or greater width than the oil supply grooves (171a-3, 575a-3) disposed at a rear side of the key portion with respect to the rotational direction of the rotating shaft.