A centrifugal compressor is provided with: a housing which houses a compressor wheel therein; a spiral scroll arranged in an outer periphery of the compressor wheel; and a diffuser portion provided as a path space communicating with the scroll from an outlet side of the compressor wheel and formed by a compressor housing and a center housing. The centrifugal compressor is also provided with a movable vane which is movable between a projecting position where the movable vane projects from the compressor housing and a housing position where the movable vane houses in a housing portion provided in compressor housing, and an actuator which drives the movable vane between the projecting position and the housing position. The actuator is provided in the center housing.