The present invention relates to a polypeptide comprising an epitope of an antigen； a kit and a composition for use in the diagnosis of allergy, wherein the kit and the composition comprise the aforementioned polypeptide, and a method for diagnosing allergy and a method for treating allergy, wherein the methods use the aforementioned polypeptide； a pharmaceutical composition comprising the aforementioned polypeptide； and a raw material or a processed product in which the antigen comprising the aforementioned polypeptide is removed or reduced. Furthermore, the present invention relates to a tester for determining the presence or absence of the antigen in an object.
