The axial fan and electronic devices

The present invention provides an axial flow fan apparatus comprising an axial flow impeller, and the drive unit cover. The axial flow impeller can be rotated relative to the shaft and including a plurality of blades is inclined direction. Axial flow impeller rotation driving unit. Drive unit cover is mounted and includes a side wall and a plurality of slit allows air circulation. Axial flow impellers disposed around the sidewall. A plurality of slits is disposed with respect to the rotation axis direction of the side wall opposite to the inclination direction of the plurality of blades tilted.