Impeller and centrifugal compressor

An impeller comprising:

• a disc having a disc shape centered on an axis;
• a cover disposed away from the disc in an axial direction in which the axis extends;
• and
• a plurality of blades connecting the disc and the cover and disposed at intervals in a rotational direction around the axis, wherein
• each of the plurality of blades includes
• a main vane extending rearward in the rotational direction as the main vane extends from an inner side toward an outer side in a radial direction centered on the axis, and
• a sub-vane disposed in front of the main vane in the rotational direction at a distance from the main vane, the sub-vane including a leading edge positioned outside a leading edge of the main vane in the radial direction,
• the main vane has a lean angle of 0 degrees or more and 20 degrees or less, and
• positions of a tip portion and a hub portion of the leading edge of the main vane in the axial direction coincide with each other as viewed from the rotational direction, the tip portion being connected to the cover, the hub portion being connected to the disc.