We report a case of eosinophilic gastroenteritis with a stenosis in the transverse colon. A patient, 54 year-old-woman, presented to our clinic with abdominal pain and diarrhea. Esophagogastric endoscopy and biopsy were normal. Contrast barium enema examination and colonic endoscopy showed a stenotic segment in the transverce colon. Biopsy specimens obteind from the stenotic segment revealed moderate eosinophilic infiltration in the colonic mucosa. Oral intake of sea shells exacerbated her symptoms. Avoiding sea shells has resulted in the disappearance of symptoms and peripheral blood eosinophilia. The present case was discussed in comparison with the 124 cases heretofore reported in Japan.