Centrifugal compressor

A centrifugal compressor comprising:

• an intake flow path connected to an intake port;
• a compressor impeller disposed in the intake flow path;
• a movable member provided on an intake port side with respect to the compressor impeller in the intake flow path, the movable member movable to a protruding position protruding into the intake flow path and a retracted position retracting from the intake flow path;
• the movable member comprising:
• a first portion that is a portion having an arc shape in a cross section taken along a rotation axis of the compressor impeller, provided on a compressor impeller side, of an inner curved surface of the movable member,
• a second portion that is a portion having an arc shape in a cross section taken along the rotation axis of the compressor impeller, provided on the intake port side, of the inner curved surface of the movable member;
• an extending portion between the first portion and the second portion, of the inner curved surface of the movable member, the extending portion extending in a direction corresponding to a rotation axis direction of the compressor impeller;
• and
• a groove extending in a circumferential direction of the compressor impeller is included on a surface of the movable member facing the intake port side,
• wherein a connection position between the second portion and the extending portion is located on the compressor impeller side with respect to a center of the movable member in the rotation axis direction, and
• wherein a curvature radius of the second portion is larger than a thickness of the movable member in the rotation axis direction.