A paint containing: a dispersing medium; a binder; a pigment; a filler; an additive; and at least one agent capable of trapping formaldehyde selected from the group consisting of a compound including an active methylene, a compound including a tannin, and a compound including an amide. In addition, a method for reducing the amount of formaldehyde in the air inside a building by applying the paint to an inner surface of the building.