PROBLEM TO BE SOLVED: To enable a volatile medicament to be efficiently released by a very small amount.SOLUTION: The sustained gas release agent is constituted of the volatile medicament and a storing container for storing the volatile medicament. The storing container has a gas-barrier properties for reducing the permeation of the gas of the volatile medicament, and the interior of the storing container can be sealed by binding at least a part thereof. A sustained release sheet having communicating holes for communicating each of one terminal, the other terminal and the side face parts to each other is arranged in the connecting part. One terminal part of the sustained release sheet is exposed to the exterior of the storing container, and the other terminal part or the side face part is exposed to the interior of the storing container to enable the gas of the volatile medicament stored in the interior of the storing container to be sustainedly released to the exterior.COPYRIGHT: (C)2008,JPO&INPIT【課題】揮散性薬剤を効率よく微量放出させることを目的とする。【解決手段】揮散性薬剤、及びこの揮散性薬剤を収納する収納容器から構成され、上記収納容器は、上記揮散性薬剤のガスの透過を抑制するガスバリア性を有し、この収納容器の少なくとも一部を接合することにより、この収納容器の内部を密封することができ、上記接合部に、一端部、他端部、及び側面部のそれぞれの間を連通する連通孔を有する徐放シートが介在され、この徐放シートの一端部が上記収納容器の外部に曝され、かつ、上記他端部又は側面部が上記収納容器の内部に曝され、上記収納容器の内部に収納された上記揮散性薬剤のガスの外部への徐放を可能とするガス徐放性製剤を用いる。【選択図】なし