Impeller and centrifugal compressor

An impeller comprising:

• a disk formed in a disk shape about an impeller axis;
• and
• a plurality of blades provided at intervals in a circumferential direction on one side of the disk, the plurality of blades defining a flow path that extends from the one side of the disk in an axial direction of the disk toward a radial outer portion of the disk, wherein
• each of the plurality of blades includes a first low-rigidity region, a second low-rigidity region, and a high-rigidity region,
• the first low-rigidity region is located at an inlet of an extending region of the flow path,
• the second low-rigidity region is located at an outlet of the extending region of the flow path,
• the high-rigidity region is located at a central portion of each of the plurality of blades between the first low-rigidity region and the second low-rigidity region,
• the first low-rigidity region and the second low-rigidity region have a same plate thickness that is smaller than that of the high-rigidity region, and
• each of the first low-rigidity region and the second low-rigidity region is attached to the disk with a same inclination from a direction perpendicular to the disk that is smaller than that of the high-rigidity region which is attached perpendicular to the disk.