PROBLEM TO BE SOLVED: To provide a medicine packaging material which has both a high medicine volatilization effect and a pollution prevention effect and which can easily obtain a package by a heat sealing method. A packaging material having a film layer made of a polyolefin-based resin containing a filler and a thermocompression bonding layer on at least one surface of the film layer, which is digitally measured using a digital Oken air permeability tester. The value obtained by measuring according to JIS P8117:2009 is 20 except that the value switch is set to 100 seconds and the air permeability high/low switching lever is set to 2000 seconds in the setting of the model Oken type air permeability tester. A packaging material having an air permeability calculated by multiplying by 5,000 to 2,000,000 seconds. [Selection diagram] None【課題】高い薬剤揮散効果と汚染防止効果を兼ね備え、ヒートシール方式で容易に包装体が得られる薬剤包装材料を提供する。【解決手段】フィラーを含有するポリオレフィン系樹脂からなるフィルム層と前記フィルム層の少なくとも一方の面に熱圧着層を有する包装材料であって、デジタル型王研式透気度試験機を用い、デジタル型王研式透気度試験機の設定においてバリュースイッチを１００秒にセットし、透気度高低切替レバーを２０００秒にセットする以外はＪＩＳ Ｐ８１１７：２００９に準じて測定して得た値に２０を乗じて計算される透気度が、５０００～２００００００秒である包装材料。【選択図】なし
