In the meantime, in the intake system of the engine in the related art, removal of a chemical substance in the air is not demanded. Accordingly, it is difficult to remove a molecular (gaseous) harmful chemical substance by a filter element provided in an engine air cleaner so as to remove dust and particulate matter in the air. The molecular (gaseous) harmful chemical substance causes a decrease of output of the fuel cell stack.

On this account, in the fuel cell vehicle, in order to remove a harmful chemical substance from the air to be supplied to the fuel cell stack, a chemical filter made of a catalyst, active carbon, or the like attached to a base material and configured to adsorb and remove the harmful chemical substance is provided in the intake system in the related art.

For example, Japanese Unexamined Patent Application Publication No. 2009-193671 (JP 2009-193671 A) describes an air cleaner in which a chemical filter is accommodated as a filter.

In the meantime, the catalyst, active carbon, or the like attached to the base material constituting the chemical filter may fall from the base material due to vibration or intake air wind. Here, in a case of an air cleaner provided only with a chemical filter, it is difficult to catch falling substances and it is difficult to catch particulate matter that does not exhibit adsorption to the chemical filter. From these points, there is room for improvement in the air cleaner described in JP 2009-193671 A.