SCROLL COMPRESSOR

PROBLEM TO BE SOLVED: To provide a scroll compressor capable of reducing stirring loss and improving compressor efficiency by suppressing oil compression of a lubricant by an Oldham ring.SOLUTION: The scroll compressor includes a revolving scroll, a fixed scroll, a frame and the Oldham ring, and an inner diameter of a face opposed to the frame, of an annular portion of the Oldham ring is larger than an inner diameter of a face opposed to the revolving scroll. Thus oil compression by the Oldham ring, of the lubricant stirred by revolving motion of a crank shaft and the like in a back pressure chamber can be suppressed, and thus, stirring loss can be reduced, and compression efficiency of the scroll compressor can be improved.