PROBLEM TO BE SOLVED: To eliminate a possibility of causing an allergy concerning a glycolipid material that excels in immunostimulation power.SOLUTION: Sorghum known as wheat alternative grain is used instead of wheat although wheat considered as a specified allergic substance has been used in a conventional method for producing a glycolipid material. A material without the anxiety of causing an allergy can therby be provided while maintaining the immunostimmulation action of the glycolipid material as it is.