A 74-year-old man presented to our hospital because of upper abdominal pain. An abdominal contrast-enhanced CT scan showed fluid collection with enhanced periphery and small quantities of free air at the midline of lower abdomen. A 16-mm sharp-shaped area of hyper absorption was also seen within the small intestine that was likely to be a foreign body like a fish bone. We decided to perform emergency laparoscopic surgery with a diagnosis of small bowel perforation caused by a foreign body. Laparoscopic findings included the greater omentum which existed so as to cover the perforated site, with the periphery at where purulent fur attached. Elevation of the small intestine outside of the abdominal cavity revealed the perforated site to be in the small bowel 20 cm distal to the Treitz ligament. Multiple diverticula were seen in a 15-cm long intestine proximal to the perforation and a 10-cm long intestine distal to the perforation. We performed partial resection of the small intestine so as to remove all these diverticula and intraperitoneal lavage and drainage. The foreign body was clarified to be a persimmon seed. The histopathological diagnosis was perforation of pseudodiverticulum. This paper deals with our experience with laparoscopic surgery for perforated small bowel diverticulum which might be caused by a persimmon seed, together with a review of the literature.