PURPOSE: To obtain an air cleaner which has a high chemical contaminant removing ability and small volume and does not generate any particle nor cause any pressure loss in an air flow by using a chemical filter in which a chemical adsorbent is carried in granular carriers in combination with another chemical filter manufactured by polymerizing another chemical adsorbent and high polymer fibers.

CONSTITUTION: Particles are removed from air 10 when the air 10 is passed through a first chemical filter 11 manufactured by polymerizing an amine group and high polymer fibers as a chemical adsorbent. The air 10 coming out from the filter 11 is passed through a second chemical filter 13 carrying potassium permanganate and almost all sulfur oxides SOx contained in the air are removed by the filter 13. The air 14 coming out from the filter 13 is passed through a third chemical filter 15 manufactured by polymerizing the amide group and high polymer fibers as a chemical adsorbent and the sulfur oxides SOx contained in the air 10 supplied from the outside are removed by the filter 15. Then cleaned air is sent out after removing the particles generated in the filter 13.