SCROLL COMPRESSOR

PROBLEM TO BE SOLVED: To solve the following problems: stable back pressure is secured by arranging a back pressure control valve controlling differential pressure, a throttle flow passage part, and an intermittent flow passage part that intermittently connecting, by orbiting motion of an orbiting scroll, in a back pressure chamber fluid outlet passage connecting a back pressure chamber with a suction chamber or a compression chamber, while communication time between the back pressure chamber and the suction chamber (or the compression chamber) is reduced and insufficient oil may be supplied to the compression chamber due to the intermittent flow passage part; while when no intermittent flow passage part is arranged, pressure pulsation in a back pressure chamber fluid outlet passage is large, the back pressure control valve abnormally opens and no back pressure is generated.SOLUTION: An enlarged space is formed along a path formed from the back pressure chamber to a suction space or the compression chamber, on a side closer to the back pressure chamber than the back pressure control valve, and has a cross-sectional area 1.5 times or more an inlet of the path, so that an inlet thereof is normally opened without being closed by the orbiting scroll.