A scroll compressor, comprising: a fixed scroll; a movable scroll provided on a lower end of the fixed scroll and engaged with the fixed scroll; a crank shaft coupled to a back surface side of the movable scroll; and a housing disposed under the movable scroll and rotatably supporting the crank shaft, and the movable scroll being rotated while pushed toward the fixed scroll, due to a high pressure acting on the back surface side of the movable scroll and rotations of the crank shaft, wherein an accommodation portion that is recessed and accommodates an Oldham coupling for preventing rotations of the movable scroll on its own axis, is formed in an outer peripheral portion of a top surface of the housing, the housing is provided, in its top surface that is closer to an inner periphery of the housing than the accommodation portion, with an inner seal ring groove and an outer seal ring groove in which an inner seal ring and an outer seal ring having different outer diameters are fitted, respectively, a space on the back surface side of the movable scroll defined by the inner seal ring and the outer seal ring serves as a back pressure chamber into which a high-pressure fluid is introduced and which thereby pushes the movable scroll against the fixed scroll, and a portion of the top surface of the housing defined by the inner seal ring groove and the outer seal ring groove is a step higher than a surface that is closer to the inner periphery of the housing than the inner seal ring groove and a surface that is closer to an outer periphery of the housing than the outer seal ring groove, and serves as a tilt limiting surface which is a surface receiving the movable scroll when the movable scroll is tilted. a fixed scroll; a movable scroll provided on a lower end of the fixed scroll and engaged with the fixed scroll; a crank shaft coupled to a back surface side of the movable scroll; and a housing disposed under the movable scroll and rotatably supporting the crank shaft, and the movable scroll being rotated while pushed toward the fixed scroll, due to a high pressure acting on the back surface side of the movable scroll and rotations of the crank shaft, wherein an accommodation portion that is recessed and accommodates an Oldham coupling for preventing rotations of the movable scroll on its own axis, is formed in an outer peripheral portion of a top surface of the housing, the housing is provided, in its top surface that is closer to an inner periphery of the housing than the accommodation portion, with an inner seal ring groove and an outer seal ring groove in which an inner seal ring and an outer seal ring having different outer diameters are fitted, respectively, a space on the back surface side of the movable scroll defined by the inner seal ring and the outer seal ring serves as a back pressure chamber into which a high-pressure fluid is introduced and which thereby pushes the movable scroll against the fixed scroll, and a portion of the top surface of the housing defined by the inner seal ring groove and the outer seal ring groove is a step higher than a surface that is closer to the inner periphery of the housing than the inner seal ring groove and a surface that is closer to an outer periphery of the housing than the outer seal ring groove, and serves as a tilt limiting surface which is a surface receiving the movable scroll when the movable scroll is tilted.