To start up a fuel battery system without the use of a towed battery or an auxiliary fan.

This invention relates to a cooling fan system for a vehicle having a driving force developed by a fuel battery that allows air to be transferred through a heat exchanger 14 by a cooling fan 12 for the purpose of cooling, and is capable of directly or indirectly supplying the air to the surroundings after satisfying at least one and more cooling tasks. This cooling fan system is characterized in that an air-branch device supplies at least a part of the air distributed by the fan to a duct, and thereby the branched air can be used for a startup of the fuel battery 36, and/or for keeping the operation of the fuel battery.