Gasritis cystica profunda (GCP) is a rare disease in which hyperplasia of mature glandular epithelium extends into the tissues beneath the submucosa. It shows multiple small cysts in the mucosa and submucosa of the stomach. It was firstly reported by Littler and Gleibermann on 1972. GCP is mainly observed at the site of gastroenterostomy but, it may occur in the stomach without a previous history of surgery. The proposed pathogenesis of the these abnormalities are related to ischemia, chronic inflammation and the presence of a foreign body. GCP may present not only as a submucosal tumor or as solitary or diffuse polyps but also as a giant gastric mucosal fold rarely. It should be differentiated from Menetrier's disease, Zollinger-Ellison syndrome, inflammatory disease and malignancy. We present a case of gastritis cystica profunda without having had any previous surgery, suspiciously caused by gastric foreign body. We made a diagnosis based on findings from the esophagogastroduodenoscopy, endoscopic ultrasonography and histologic findings after surgery.