Air supply device

The present invention provides an air blowing device comprising: a rotor blade capable of rotating about a central axis extending in the vertical direction; a motor that rotates the rotor blade; a housing surrounding the rotor blades and the motor; and a substrate disposed radially inward of a peripheral wall portion of the housing, the housing having: a holding portion provided below the rotor blades and holding the motor; and the peripheral wall part which is cylindrical with the central axis as the center and extends upwards from the radial outer end part of the holding part, and is characterized in that the peripheral wall part is provided with a peripheral wall concave part which is concave downwards from the upper end part of the peripheral wall part; the peripheral wall portion has a peripheral wall recess that connects a space further inward in the radial direction than the peripheral wall portion and a space further outward in the radial direction than the peripheral wall portion, and the substrate a