A centrifugal compressor comprising: a housing including an intake port having an opening in a direction of a rotation shaft of the centrifugal compressor and an intake channel connecting to the intake port; an impeller wheel disposed inside the housing so as to be rotatable about the rotation shaft and configured to compress intake air flowing in via the intake port; a parallel flow generating unit disposed between the intake port and the impeller wheel and configured to rectify the intake air flowing in via the intake port to be parallel to the direction of the rotation shaft; and a recirculation channel through which an outer circumferential section of the impeller wheel communicates with a recirculation port disposed on the intake channel at an upstream side of the impeller wheel, wherein the parallel flow generating unit includes a parallel flow generating part including a plurality of guide vanes arranged in a circumferential direction along an inner circumferential wall of the housing, the parallel flow generating part being configured to rectify the intake air flowing in via the intake port to be parallel to the direction of the rotation shaft by the guide vanes, and a central intake-air flowing section which is a space surrounded by the parallel flow generating part and which has an opening in the direction of the rotation shaft so that the intake air flowing in via the intake port flows through the opening, and wherein an intake-air outflow direction from the recirculation port is oriented in a direction toward the parallel flow generating part as seen from a direction orthogonal to the direction of the rotation shaft, wherein the intake-air outflow direction from the recirculation port is such a direction that the intake air intersects with the direction of the rotation shaft and that at least a part of the intake air intersects with upstream edges of the guide vanes, wherein edges of the guide vanes adjacent to the rotational axis are disposed on a side adjacent to the rotational axis with respect to an outer circumference of an upstream edge of the impeller wheel, and wherein a height of the guide vanes is smaller than a height of the leading edges of the impeller wheel. a housing including an intake port having an opening in a direction of a rotation shaft of the centrifugal compressor and an intake channel connecting to the intake port; an impeller wheel disposed inside the housing so as to be rotatable about the rotation shaft and configured to compress intake air flowing in via the intake port; a parallel flow generating unit disposed between the intake port and the impeller wheel and configured to rectify the intake air flowing in via the intake port to be parallel to the direction of the rotation shaft; and a recirculation channel through which an outer circumferential section of the impeller wheel communicates with a recirculation port disposed on the intake channel at an upstream side of the impeller wheel, wherein the parallel flow generating unit includes a parallel flow generating part including a plurality of guide vanes arranged in a circumferential direction along an inner circumferential wall of the housing, the parallel flow generating part being configured to rectify the intake air flowing in via the intake port to be parallel to the direction of the rotation shaft by the guide vanes, and a central intake-air flowing section which is a space surrounded by the parallel flow generating part and which has an opening in the direction of the rotation shaft so that the intake air flowing in via the intake port flows through the opening, and wherein an intake-air outflow direction from the recirculation port is oriented in a direction toward the parallel flow generating part as seen from a direction orthogonal to the direction of the rotation shaft, wherein the intake-air outflow direction from the recirculation port is such a direction that the intake air intersects with the direction of the rotation shaft and that at least a part of the intake air intersects with upstream edges of the guide vanes, wherein edges of the guide vanes adjacent to the rotational axis are disposed on a side adjacent to the rotational axis with respect to an outer circumference of an upstream edge of the impeller wheel, and wherein a height of the guide vanes is smaller than a height of the leading edges of the impeller wheel.