PROBLEM TO BE SOLVED: To provide a bactericidal agent sustained release body capable of suppressing introduction cost or maintenance cost of a facility, and usable for a food product preserved by freezing or the like.SOLUTION: There is provided a bactericidal agent sustained release body 1 stored in a packaging container 2 together with a food product 3. In the bactericidal agent sustained release body 1, a liquid bactericidal agent formed by dissolving hypochlorous acid ion which is a food additive into alkali aqueous solution is held, and the held liquid bactericidal agent is naturally vaporized in the packaging container 2 to sterilize the inside of the packaging container 2.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2017,JPO&INPIT【課題】設備の導入コストやメンテナンスコストを抑制することができ、かつ、冷凍保存等される食品についても使用可能な除菌剤徐放体の提供。【解決手段】包装容器2内に食品3と共に収容される除菌剤徐放体1であって、食品添加物である次亜塩素酸イオンがアルカリ水溶液中に溶解されたものである液体除菌剤を保持すると共に、保持した前記液体除菌剤を包装容器2内で自然気化させて包装容器2内を除菌する、除菌剤徐放体1。【選択図】図3