PROBLEM TO BE SOLVED: To provide a novel antibacterial composition that contains a highly safe, natural food additive and is water-soluble and useful.SOLUTION: A antibacterial composition contains a complex in which lysozyme and water-soluble chitosan are bonded together.SELECTED DRAWING: Figure 1【課題】安全性の高い天然の食品添加物を用いるとともに水溶性で有用な新規な抗菌性組成物を提供する。【解決手段】リゾチームと水溶性キトサンとを結合させた複合体を含有する抗菌性組成物。【選択図】図1