PROBLEM TO BE SOLVED: To secure a surface area even if reducing a size of an entire structure containing volatile chemical and thereby suppress an amount of volatilization decrease of the volatile chemical, and reduce a portion coming into contact with the inner wall of a container out of the surface area of the entire structure as much as possible to thereby avoid the volatilization of the volatile chemical from being obstructed and prevent the contamination of the container.SOLUTION: A three-dimensional structure is characterized in that a resin composition containing the volatile chemical having volatilization properties is formed in a shape of a flat plate. The three-dimensional structure has through-holes penetrated from the front to the back face, and the peripheral edges of the through-holes have shapes selected from polygonal shapes, circular shapes, circular arc shapes and spiral shapes when the three-dimensional structure is viewed from the front. The peripheral shapes of the through-holes have shapes formed in coplanar or continuously changing surfaces.SELECTED DRAWING: Figure 2【課題】揮散性薬剤を含有する構造体全体の大きさを小さくしても、表面積を確保して揮散性薬剤の揮散量低下を抑え、かつ、構造体全体の表面積のうち容器の内壁に接触しうる部分をできるだけ少なくし、揮散性薬剤の揮散が妨げられるのを避けるとともに容器の汚染を防止することを目的とする。【解決手段】揮散性を有する揮散性薬剤を含有させた樹脂組成物を平板状に成形した立体構造体であり、立体構造体は、正面から背面にかけて貫通した貫通孔を有し、立体構造体を正面から見たとき、貫通孔の周縁は、多角形状、円状、円弧状及び渦巻き状から選ばれる形状を有し、貫通孔の周縁の形状は、同一平面、又は連続して変化する面に形成された形状とする。【選択図】図２
