PURPOSE: To obtain a compressor which may stand high pressure and rotational speed of a wide range, by supporting a rotary sleeve with respect to a center housing by means of static pressure and dynamic pressure of a compressible fluid.

CONSTITUTION: A rotor 5 is surrounded by a center housing 22, a front housing 21 and a rear housing 23, a rotary sleeve 3 being fitted between the rotor 5 and the center hosuing 22. A pressure gas chamber 9 defined between the center housing 22 and the rotary sleeve 3, is communicated with a high pressure communicating hole 92 through a throttle part 91. Since the high pressure communicating hole 92 is communicated with an outlet chamber 63 through an annular passage 93 and an outlet chamber communicating hole 92, static pressure in the high pressure communicating hole 92 is substantially equal to that in the outlet chamber 63, and is coverted into dynamic pressure through a throttle part 91. Therefore, the rotary sleeve is supported by such a dynamic pressure and static pressure of gas jetted into the pressure gas chamber 9.