A scroll compressor comprising: a casing; a compression mechanism which is contained in the casing, and includes a fixed scroll having an end plate portion, an outer peripheral portion formed on an outer periphery of the end plate portion, and a wrap placed upright inside the outer peripheral portion, and an orbiting scroll having an end plate portion slidably contacting with the outer peripheral portion of the fixed scroll and a front end portion of the wrap of the fixed scroll, and a wrap placed upright on the end plate portion; a pressing mechanism which applies a pressing force toward the fixed scroll to a back side of the end plate portion of the orbiting scroll; a pushback mechanism which applies a pushback force separating the orbiting scroll from the fixed scroll to a front of the end plate portion of the orbiting scroll; and at least one adjusting mechanism having a low-pressure portion (12a, 43, 44) filled with a fluid of lower pressure than a discharge pressure of the compression mechanism, and a communicating groove (90, 96, 101, 102) formed in a sliding surface of the outer peripheral portion of the fixed scroll so as to communicate with the low-pressure portion (12a, 43, 44) in a first rotational angle range for reducing an upsetting moment of the orbiting scroll, and to be blocked from the low-pressure portion (12a, 43, 44) in a second rotational angle range other than the first rotational angle range, characterized in that the pushback mechanism includes a high-pressure side oil groove which is formed in the sliding surface of the outer peripheral portion of the fixed scroll and into which a lubricating oil with a high pressure corresponding to the discharge pressure of the compression mechanism flows, and the communicating groove (90, 96) is formed on the outside in a radial direction of the high-pressure side oil groove. a casing; a compression mechanism which is contained in the casing, and includes a fixed scroll having an end plate portion, an outer peripheral portion formed on an outer periphery of the end plate portion, and a wrap placed upright inside the outer peripheral portion, and an orbiting scroll having an end plate portion slidably contacting with the outer peripheral portion of the fixed scroll and a front end portion of the wrap of the fixed scroll, and a wrap placed upright on the end plate portion; a pressing mechanism which applies a pressing force toward the fixed scroll to a back side of the end plate portion of the orbiting scroll; a pushback mechanism which applies a pushback force separating the orbiting scroll from the fixed scroll to a front of the end plate portion of the orbiting scroll; and at least one adjusting mechanism having a low-pressure portion (12a, 43, 44) filled with a fluid of lower pressure than a discharge pressure of the compression mechanism, and a communicating groove (90, 96, 101, 102) formed in a sliding surface of the outer peripheral portion of the fixed scroll so as to communicate with the low-pressure portion (12a, 43, 44) in a first rotational angle range for reducing an upsetting moment of the orbiting scroll, and to be blocked from the low-pressure portion (12a, 43, 44) in a second rotational angle range other than the first rotational angle range, characterized in that the pushback mechanism includes a high-pressure side oil groove which is formed in the sliding surface of the outer peripheral portion of the fixed scroll and into which a lubricating oil with a high pressure corresponding to the discharge pressure of the compression mechanism flows, and the communicating groove (90, 96) is formed on the outside in a radial direction of the high-pressure side oil groove.