A centrifugal compressor includes: a casing; a compression mechanism disposed inside the casing; a flow rate regulation valve disposed inside the casing and that regulates a flow rate of air sucked into the casing; a conversion mechanism disposed outside the casing and that changes a direction of the flow rate regulation valve based on an output of an actuator; and a cover that surrounds and houses the conversion mechanism, wherein dry air is supplied to an inside of the cover, and the cover forms an air reservoir that prevents dew condensation on the conversion mechanism.