To provide emulsifying agents having immunostimulation properties using a biologically derived substance.SOLUTION: The present invention provides an immunostimulating emulsifying agent comprising a GAS family protein derived from a fungal. Preferably, the GAS family protein is GAS1. Since thereby an emulsifying agent having immunostimulation properties using biologically derived substance is provided, applying it as functional materials in wide fields where emulsifying agents are used becomes possible.SELECTED DRAWING: None

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