Problem A centrifugal compressor is provided which is more efficient and effective compared to the prior art, and which can improve efficiency in the low throughput zone more economically and extend the operating range. Means for Solving A centrifugal compressor includes an impeller 17; a compressor cover 20 including at least one inlet pipe portion 24 with an intake air flow path configured to send gas to the impeller 17; a movable member 31 disposed within the compressor cover 20 so as to be movable along a direction of an axis O1 of the impeller 17; and a moving mechanism configured to move the moving member 31 along the direction of the axis O1 of the impeller 17, the moving mechanism moving the moving member 31 in the direction of the axis O1 around the moving member 31 and an inner wall surface of the compressor cover 20 to bring into contact with each other. At least one of the compressor cover 20
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