<p>An air blowing device for sucking air into an air duct and discharging the air to an air discharge duct, wherein the air blowing device is provided with: a frame for forming the outer shell; a fan located on the inner side of the frame, driven by a motor, and having a fan outlet; a duct connection section having a duct connection opening located on the outer side of the frame and connected to the air discharge duct; and an in-frame outlet section located on the inner side of the frame and connecting the duct connection section and the fan outlet. In the in-frame outlet section and the duct connection section, the cross-sectional shape of the air duct continuously and smoothly changes from the fan outlet to the duct connection opening.</p>
