PROBLEM TO BE SOLVED: To obtain an emulsifier that has excellent emulsifying capacity and high safety.SOLUTION: There are provided an emulsifier including chitin nanofiber or surface-chitosan-chitin nanofiber and a method for producing an emulsion using the emulsifier.SELECTED DRAWING: NoneCOPYRIGHT: (C)2019,JPO&INPIT【課題】乳化力が強く、安全性が高い乳化剤を得る。【解決手段】キチンナノファイバーまたは表面キトサン化キチンナノファイバーを含む乳化剤ならびに該乳化剤を用いる乳化物の製造方法。【選択図】なし