Jejunal and ileal diverticula are rare in adults. Duodenal diverticula are five times more prevalent than jejunoileal diverticula. Most patients are asymptomatic. However, chronic symptoms including intermittent abdominal pain, flatulence, diarrhea and constipation are seen in 10%-30% of patients. Gastric cancer is the second most common cancer in South Korea and here we report a case of early gastric cancer with multiple duodenal and jejunal diverticula. A 67-year-old woman was admitted to Konkuk University Medical Center with chronic diarrhea and weight loss of 19 kg over 2 months. Following gastroduodenoscopy, we identified adenocarcinoma of the lower body of the stomach. On abdominopelvic computed tomography, diverticula of duodenum and jejunum were found. Patient underwent distal gastrectomy and gastroduodenostomy with lymphadenectomy. She was discharged on the tenth postoperative day without complications.