PROBLEM TO BE SOLVED: To provide a mucosal adjuvant useful for preparation of a mucosal vaccine with high mucosal immunogenicity and high safety, and a mucosal vaccine composition containing the same.SOLUTION: A mucosal adjuvant is composed of TGDK.SELECTED DRAWING: NoneCOPYRIGHT: (C)2020,JPO&INPIT【課題】粘膜免疫原性が高く且つ安全性が高い粘膜ワクチンの調製に有用な粘膜アジュバント、及びそれを含む粘膜ワクチン組成物を提供する。【解決手段】TGDKからなる粘膜アジュバント。【選択図】なし