PROBLEM TO BE SOLVED: To provide a medicament volatilizing body where a medicament is stored between a container and a flexible sheet and the sure diffusion of the medicament is realized by properly breaking the flexible sheet.SOLUTION: In a medicament volatilizing body 1 including a container 10 having a bottom wall 11 and a side wall 12 and being formed with an opening 13 at the upper end part 12a of the side wall 12 and a flexible sheet 20 attached to the container so as to close the opening 13 and being formed with a medicament storing portion 30 between the container 10 and the flexible sheet 20,: the flexible sheet 20 has a volatilization layer 21 volatilizing the medicament and a breaking layer 22 disposed at a container 10 side from the volatilization layer 21; and a breaking starting point more fragile than the other portion is disposed on the breaking layer 22.SELECTED DRAWING: Figure 2【課題】容器と可撓性シートとの間に薬剤を収容する薬剤揮散体において、可撓性シートを適切に破断させることにより、薬剤の確実な放散を実現させる。【解決手段】底壁11及び側壁12を有し側壁12の上端部12aに開口部13が形成される容器10と、開口部13を閉鎖するように容器に取り付けられる可撓性シート20と、を備え、容器10と可撓性シート20との間に薬剤収容部30が形成される薬剤揮散体1であって、可撓性シート20は、薬剤を揮散させる揮散層21と、揮散層21よりも容器10側に配置される破断層22と、を有し、破断層22には、他の部分よりも脆弱な破断起点部が設けられている。【選択図】図2