A compressor system includes; a compression section that sucks and compresses gas; a rotor that includes the compression section; a gas bearing that supports the rotor; a dynamic-pressure generating gas supply system that supplies, to a gas supply port for dynamic pressure of the gas bearing, bleed gas from the gas pressurized by the compression section; and an external gas supply system for static pressure that supplies, to a gas supply port for static pressure of the gas bearing, external gas from outside of the compression section. The dynamic-pressure generating gas supply system and the external gas supply system for static pressure respectively include paths that are independent of each other to the gas bearing. The gas supply port for dynamic pressure and the gas supply port for static pressure are independent of each other.