The purpose of the present invention is to provide a deodorizing filter that has excellent air permeability and excellent deodorizing capability against a gas having an unpleasant foul odor. Moreover, the purpose of the present invention is to provide a deodorizing filter and a deodorizing mask, in which both the deodorizing filter and the deodorizing mask using the filter have no unpleasant odor and, even if they are stored in a closed environment or the like, can be comfortably used without generating an offensive odor or discoloration. This deodorizing filter for a mask has at least two deodorizing fiber layers including fibers and a chemical adsorption-type deodorizer, and the deodorizing filter for a mask is characterized in that each of the deodorizing fiber layers includes polyethylene resin fibers, the thickness of each of the deodorizing fiber layers is 0.15 to 0.4 mm, and the basis weight of each of the deodorizing fiber layers is 20 to 45 g/m2.本發明之目的在於提供消臭過濾器,其係透氣性優異,同時對於不舒服的惡臭氣體之消臭性能優異。又,目的在於提供消臭過濾器及消臭口罩,其係在消臭過濾器及使用其的消臭口罩本身,沒有不舒服的臭,即使於密閉環境下保管等時,也幾乎不發生不舒服的臭氣及變色,可舒適地使用。本發明之口罩用消臭過濾器之特徵為具備2層以上的包含纖維與化學吸附型消臭劑之消臭纖維層,前述消臭纖維層含有聚乙烯樹脂纖維,前述消臭纖維層的厚度為0.15~0.4mm,而且消臭纖維層的單位面積重量為20~45g/m2。7‧‧‧外部氣體側PP製不織布層8‧‧‧消臭不織布層(消臭纖維層)9‧‧‧防塵不織布層10‧‧‧顏面側PP製不織布層11‧‧‧定形褶