We report a case of a true enterolith containing dental implant developed in the cecum. An 81-year-old man was admitted to the hospital for midline incisional hernia. During laparotomy, seven enteroliths were found in the cecum and dilated loops of proximal ileum. Infrared analysis and cross section of the stones revealed all enteroliths containing bile acid. One stone contained a dental implant as its core. We concluded this enterolith was primary enterolith due to the dental implant and enterostasis. True enterolith is relatively rare. So far 43 cases, including our case, have been reported in Japan. In addition, this is the 2nd case report of true enterolith containing foreign materials in Japan. The side-to-side anastomosis created by a previous operation for appendicitis provided a static environment for the formation of enteroliths in the cecum.