The present invention provides a serial axial flow fan. The serial axial flow fan includes a first axial flow fan, a second axial flow fan, and a current plate. Hollow cells of the current plate are partitioned by a lattice-shaped partition, penetrate in an axial direction, and are uniformly two-dimensionally arranged at an outer edge. An axially lower end portion of a first housing of the first axial flow fan and an axially upper end portion of a second housing are directly coupled to each other, and the current plate is provided in a coupling unit of the first housing and the second housing.An axially lower end portion of the first tubular unit of the first housing is axially opposed to an axially upper end portion of the second tubular unit of the second housing with the current plateinterposed therebetween. A recess recessed on an opposite side to the coupling unit in the axial direction is provided on an axially end surface of at least one of an axially lower end surface of thefirst tubular unit and an axially upper end surface of the second tubular unit. A lead wire of at least one of the first axial flow fan and the second axial flow fan is accommodated in the recess. Atleast a portion of the recess overlaps a portion of the current plate in the axial direction.