An aldehyde gas deodorant dispersion composed of a mixture of an aminoguanidine salt that has a pH of 1 to 7 when dissolved in purified water and an acidic silica sol, the dispersion having a pH of 1 to 7, wherein a content of the aminoguannidine salt is 0.01 to 100 parts by weight relative to 100 parts by weight of a silica (SiO2) content of the acidic silica sol. The deodorant dispersion can provide excellent deodorizing performance for an aldehyde gas, such as acetaldehyde or formaldehyde, and can further provide excellent deodorizing performance for various types of odors other than aldehyde gases. In addition, the deodorant dispersion can provide deodorizing performance over a wide range of temperatures.
