A scroll fluid machine has a low-pressure stage compression part for
compressing a fluid sucked in from the outside between mutually
overlapping wrap portions of two scroll members performing a relative
orbiting motion and a high-pressure stage compression part for
compressing the fluid sucked in from the low-pressure stage compression
part between mutually overlapping wrap portions of two scroll members
performing a relative orbiting motion. The scroll members in the
low-pressure stage compression part have a larger radial gap between the
wrap portions than that of the scroll members in the high-pressure stage
compression part.