PROBLEM TO BE SOLVED: To provide an air purification filter equipped with a gas removal sensing function capable of easily discriminating discoloration due to gas. SOLUTION: In an air purification filter 1 including a filter medium 2 for purifying air, a frame 3 for holding the filter medium 2 in a pleated shape, and a shape retaining member 4, the filter medium 2 has a dust collecting layer 6. At least one kind of gas that can be removed by the adsorbent 9 is provided on a part or all of the shape-retaining member 4 that is provided with an aggregate 7 and an adsorbent 9 for removing gas. Since the gas indicator 8 that reacts with and changes color is provided, the color change of the gas indicator 8 occurs in the shape retaining member 4 that is not easily affected by coloring by the particulate matter contained in the air, and the surrounding filter medium 2 It is possible to provide the air purification filter 1 having a gas removal sensing function that allows the user to easily determine that the filter is removing gas by changing the color to a color different from. [Selection diagram] Fig. 3【課題】ガスによる変色を容易に判別できるガス除去センシング機能を備えた、空気浄化フィルタを提供することを目的とする。【解決手段】空気を浄化するためのろ材２と、ろ材２をプリーツ形状に保持するための枠３および形状保持部材４を備えた空気浄化フィルタ１において、前記ろ材２は集塵層６と、骨材７と、ガスを除去するための吸着剤９を備え、空気の流入側に位置する前記形状保持部材４の一部または全部に、前記吸着剤９で除去可能なガスのうち少なくとも一種類と反応して変色するガス指示薬８を備えた構成としたことで、空気中に含まれる粒子状物質による着色の影響を受けにくい形状保持部材４でガス指示薬８の変色が起こり、周囲のろ材２とは異なる色に変化していくことで、フィルタがガス除去していることを使用者が容易に判別できるガス除去センシング機能を備えた、空気浄化フィルタ１を提供することができる。【選択図】図３
