A centrifugal compressor , comprising: an impeller ; a compressor inlet pipe for guiding air to the impeller ; a scroll passage disposed on an outer peripheral side of the impeller ; and a bypass passage connecting the compressor inlet pipe and the scroll passage and bypassing the impeller , wherein, when B is a virtual line connecting centers of gravity of cross-sections of the bypass passage in a flow direction of the bypass passage , in a cross-section perpendicular to a rotational axis of the impeller , C is a virtual circle constituting an inner wall surface of the compressor inlet pipe , P1 is an intersection between the virtual circle C and the virtual line B, and L2 is a tangent line of the virtual line B at the intersection P1, and in a meridian plane of the centrifugal compressor , P3 is an intersection between the axis O1 of the compressor inlet pipe and the tangent line L2, L5 is a line segment of the axis O1 of the compressor inlet pipe extending from the intersection P3 upstream in a flow direction (F) of the compressor inlet pipe , and L6 is a half-line of the tangent line L2 extending from the intersection P3 into the bypass passage , an angle θ3 between the line segment L5 and the half-line L6 at the intersection P3 satisfies 90°<θ3, characterised in that the centrifugal compressor further comprises at least one extension part disposed between a leading edge of a blade of the impeller and a connection port of the bypass passage formed on the compressor inlet pipe in an axial direction of the compressor inlet pipe , the at least one extension part extending along a direction parallel to the axis O1 so as to protrude from the inner wall surface of the compressor inlet pipe inward in a radial direction of the compressor inlet pipe . an impeller ; a compressor inlet pipe for guiding air to the impeller ; a scroll passage disposed on an outer peripheral side of the impeller ; and a bypass passage connecting the compressor inlet pipe and the scroll passage and bypassing the impeller , wherein, when B is a virtual line connecting centers of gravity of cross-sections of the bypass passage in a flow direction of the bypass passage , in a cross-section perpendicular to a rotational axis of the impeller , C is a virtual circle constituting an inner wall surface of the compressor inlet pipe , P1 is an intersection between the virtual circle C and the virtual line B, and L2 is a tangent line of the virtual line B at the intersection P1, and in a meridian plane of the centrifugal compressor , P3 is an intersection between the axis O1 of the compressor inlet pipe and the tangent line L2, L5 is a line segment of the axis O1 of the compressor inlet pipe extending from the intersection P3 upstream in a flow direction (F) of the compressor inlet pipe , and L6 is a half-line of the tangent line L2 extending from the intersection P3 into the bypass passage , an angle θ3 between the line segment L5 and the half-line L6 at the intersection P3 satisfies 90°<θ3, characterised in that the centrifugal compressor further comprises at least one extension part disposed between a leading edge of a blade of the impeller and a connection port of the bypass passage formed on the compressor inlet pipe in an axial direction of the compressor inlet pipe , the at least one extension part extending along a direction parallel to the axis O1 so as to protrude from the inner wall surface of the compressor inlet pipe inward in a radial direction of the compressor inlet pipe . <EOS>