Wheel part, impeller and air supply device

The utility model provides a wheel part, an impeller and an air supply device. The wheel part rotates around a central axis extending up and down, and the wheel part is provided with a base part and aplurality of blades. The base portion expands in a direction perpendicular to the central axis. The plurality of blades are arranged on the upper surface of the base part at intervals in the circumferential direction. The base portion has, on the outside in the radial direction, a concavo-convex portion in which concavo-convex repeatedly occurs in the circumferential direction. The concavo-convexportion has at least one first concavo-convex region and a second concavo-convex region. The first concave-convex region includes a plurality of first concave portions having the same shape and a plurality of first convex portions having the same shape, and the first concave portions and the first convex portions are alternately arranged one by one. The second concavo-convex region is located between the first concavo-con