Duodenal diverticula are common, but perforated duodenal diverticulum is rare. Because of the disease rarity, there is no standard management protocol for perforated duodenal diverticulum. To properly manage this rare complication, a clear preoperative diagnosis and clinical disease severity assessment are important. An abdomino-pelvic CT is an unquestionably crucial diagnostic tool. Perforation is considered a surgical emergency, although conservative treatment based on fasting and broad-spectrum antibiotics may be offered in some selected cases. Herein, we report two cases of perforated duodenal diverticulum, one case managed with surgical treatment and one with conservative treatment.