To provide a composition for termite proof capable of being effectively filled in a gap part formed at a contact part of an underfloor structures each other, capable of conducting quantitative operations at a construction site, having no generation of problems generated until completion of drying, capable of preventing entry of termite over long time, and capable of being applied to an existing building.SOLUTION: A composition for termite contains a butyl rubber:5 to 25 mass%, hydrogenated petroleum resin:35 to 55 mass%, polybutene:5 to 25 mass%, and an inorganic filler:15 to 35 mass%, and has elongation rate at 20°C of 1000% or more.SELECTED DRAWING: Figure 1
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