A scroll compressor, comprising: a partition plate for partitioning an interior of a hermetic container into a high pressure space and a low pressure space ; a fixed scroll which is adjacent to the partition plate ; an orbiting scroll which is meshed with the fixed scroll and which forms a compression chamber ; a rotation-restraining member for preventing the orbiting scroll from rotating; and a main bearing for supporting the orbiting scroll , in which the fixed scroll , the orbiting scroll , the rotation-restraining member and the main bearing are placed in the low pressure space , and the fixed scroll and the orbiting scroll are placed between the partition plate and the main bearing , wherein the scroll compressor further includes a bearing-side concave portion formed in an upper surface of the main bearing , a scroll-side concave portion formed in a lower surface of the fixed scroll , and a columnar member having a lower end inserted into the bearing-side concave portion and an upper end inserted into the scroll-side concave portion , wherein the columnar member can slide with at least one of the bearing-side concave portion and the scroll-side concave portion , thereby permitting the fixed scroll to move in an axial direction of the fixed scroll between the partition plate and the main bearing , characterized in that either a fitting gap between the bearing-side concave portion and the columnar member and a fitting gap between the scroll-side concave portion and the columnar member are different from each other; or that an insertion portion of the columnar member of the bearing-side concave portion is provided with a pin hole, and the pin hole is provided with a retaining pin of the columnar member . a partition plate for partitioning an interior of a hermetic container into a high pressure space and a low pressure space ; a fixed scroll which is adjacent to the partition plate ; an orbiting scroll which is meshed with the fixed scroll and which forms a compression chamber ; a rotation-restraining member for preventing the orbiting scroll from rotating; and a main bearing for supporting the orbiting scroll , in which the fixed scroll , the orbiting scroll , the rotation-restraining member and the main bearing are placed in the low pressure space , and the fixed scroll and the orbiting scroll are placed between the partition plate and the main bearing , wherein the scroll compressor further includes a bearing-side concave portion formed in an upper surface of the main bearing , a scroll-side concave portion formed in a lower surface of the fixed scroll , and a columnar member having a lower end inserted into the bearing-side concave portion and an upper end inserted into the scroll-side concave portion , wherein the columnar member can slide with at least one of the bearing-side concave portion and the scroll-side concave portion , thereby permitting the fixed scroll to move in an axial direction of the fixed scroll between the partition plate and the main bearing , characterized in that either a fitting gap between the bearing-side concave portion and the columnar member and a fitting gap between the scroll-side concave portion and the columnar member are different from each other; or that an insertion portion of the columnar member of the bearing-side concave portion is provided with a pin hole, and the pin hole is provided with a retaining pin of the columnar member . <EOS>