PROBLEM TO BE SOLVED: To provide a sustained drug-releasing sheet which can continually provide sustained release of volatile drugs such as allyl isothiocyanate, pyrethroid-based drugs and the like, and which does not bring about peeling and deformation with passage of time.SOLUTION: A sustained volatile drug-releasing sheet 10 comprises: permeable film layers 12a and 12b made of a resin, through which volatile drugs can permeate, on both surfaces of a kneaded material layer 11 formed of a kneaded material containing a volatile drug and a resin； surface barrier layers 13a and 13b which show impermeability against the volatile drugs, and are formed respectively on the permeable film layers 12a and 12b； and a plurality of drug permeation parts scattered, which are obtained by removing portions of surface barrier layers 13a and 13b to expose the permeable film layers 12a and 12b or the kneaded material layer.SELECTED DRAWING: Figure 1【課題】アリルイソチオシアネートやピレスロイド系薬剤などの揮散性薬剤を持続的に徐放させることができ、時間経過とともに剥離や変形を起こさずに済む徐放性シートの提供。【解決手段】揮散性薬材と樹脂とを含む混練物からなる混練物層１１の両面に、揮散性薬剤を透過しうる樹脂製である透過性フィルム層１２a、１２bを有し、透過性フィルム層１２ａ，１２ｂの上に更に、上記揮散性薬剤に対して非透過性を示す表面バリア層１３a、１３bをそれぞれ形成してあり、表面バリア層１３a、１３bの一部を欠落させて、透過性フィルム層１２a、１２bを露出させ。又は上記混練物層を露出する薬剤透過部を分散して複数有する揮散性薬剤徐放性積層シート１０。【選択図】図１
