Axial flow fan

A fan includes a motor, an impeller fixed to the motor, and a housing including a cylindrical inner circumferential surface. The impeller includes a plurality of blades extending radially outward. The housing is arranged to surround outer peripheries of the motor and the impeller. The housing includes an intake port which is an upper opening of the housing, an upper edge which surrounds the intake port, an exhaust port which is a lower opening of the housing, a lower edge which surrounds the exhaust port. An axial distance from an upper end of each of the blades to an upper edge is ½ times or more of an axial distance from the upper end of each of the blades to a lower end thereof. This makes it possible to restrain an air flow having a swirling component from passing through the intake port.