PROBLEM TO BE SOLVED: To provide a fumigation agent composition, fumigation equipment and a fumigation method, little in remaining odor after fumigation and excellent in microorganism suppressing effect and deodorant effect.SOLUTION: The fumigation agent composition comprises an agent containing silver and an organic foaming agent. The former agent preferably has a 0.01-1,000 μm volume-average particle diameter, the organic foaming agent is preferably azodicarbonamide, and more preferably contains as an foaming auxiliary one or more selected from the group consisting of zinc oxide, zinc carbonate, zinc stearate, magnesium stearate, magnesium oxide, calcium carbonate and calcium phosphate. The fumigation equipment 10 comprises a fumigation agent part 32 filled with the fumigation agent composition, a heating part 20, and a heat transfer part transferring heat generated in the heating part to the fumigation agent part. The fumigation method comprises indirectly heating the fumigation composition.
