Inclusion Criteria:  Patients who were diagnosed with acute or chronic gastritis in a gastroscopy performed within 7 days prior to administration of this trial. At least one or more erosions have been identified on gastroscopy. Patients who decided to voluntarily participate in this trial and agreed in writing.  Exclusion Criteria:  Patients who can not undergo gastroscopy Peptic ulcer (except scarring) and reflux esophagitis Patients who have had gastric acid suppression surgery or stomach/esophagus surgery (except for simple perforation surgery and appendectomy) Patients with a history of gastrointestinal malignancies Zollinger-Ellison syndrome patients Patient with spontaneous coagulation disorder Patients with an allergic or hypersensitive response to a study drug Patients with a potential pregnancy. Patients who had clinically significant abnormalities in the screening test. Pregnant and lactating women Those currently taking other study drugs patients who were judged to be ineligible for the trial by the principle investigator and the person in charge.