To solve such a problem that a whole deodorizing filter has to be exchanged when through-holes are clogged by the adhesion of oil and dust, etc., to a gas inflow port using a honeycomb filter, etc., because of temporal change when the deodorizing filter of a self-regeneration type by a catalytic function is used, so as to remove an odor substance containing oil from a kitchen or a food-processing factory.

The deodorizing filter with a honeycomb structure, which is obtained by adding an ultrafine nanoparticle shaped metallic catalyst with an oil dissolving function and a deodorizing function to an inorganic powder raw material composed of a high-specific surface area ceramic material, a pore former, an organic binder, moisture, and a lubricant, is made to be a pre-layer with the length of around 30 mm and to be arranged by adhesion on the front part of the deodorizing filter with the honeycomb structure.