An air cleaner not susceptible to a decrease in effect. The air cleaner includes: a storage tank that stores a liquid; and an air blowing unit. In the air cleaner, the storage tank has an air receiving region and a dust retention region formed therein, and the air blowing unit blows air to the air receiving region. The dust retention region is a region partitioned by a wall in which an opening is formed toward an upstream side of a flow of the liquid.