Thought Taeniasis now is rarely found in Taiwan, it is one of the common parasitic infection in developing countries. As the number of immigrant workers is increasing in Taiwan, the clinicians need to take care and rule out the parasite infection. A Thailand immigration worker, who had a hand injury, complained of abdominal discomfort in association with mild diarrhea when seeking care at our hospital parasitic infection was suspected. After 3 weeks of mebendazole (100 mg, tid, for 6 days), adult tapeworm proglottids and gravid proglottids were found in the feces. The length of the tapeworm was more than 125 cm. The Mebendazole is highly effective in treating parasite infection within a few days, but for tapeworm infection several more weeks of treatment may be needed. To ensure eradication of tapeworm infection, identification of the scolex in the feces is important after treatment.