The removal of acetaldehyde by sepiolite combined with 2-aminobenzoic acid (OABA)(sepiolite-OABA complex) from ambient air was studied in comparison with that of the aldehyde by sepiolite, coconut-shell active carbon (carbon), 5A-zeolite, 13X-zeolite, diatomaceous earth, as well as these porous material-OABA complexes. Experiments were done at 25°C in ambient air. The removal rate of the aldehyde by these porous material-OABA (10%) complexes followed the order of sepiolite->>carbon->13X-zeolite->5A-zeolite->diatomaceous earth-OABA (10%) complexes. The amount of the aldehyde removed by the sepiolite-OABA complex was much larger than that by OABA and that by sepiolite itself. The larger removal rate of the aldehyde by the sepiolite-OABA complex was thought to be caused through the reaction between the aldehyde and OABA which is activated by sepiolite. The removal of the aldehyde by the sepiolite-OABA complex was particularly remarkable when the aldehyde concentration was low, e. g., such as 1-10 ppm. This complex was thought to be very useful as the deodorant for acetaldehyde.