This report describes a rare case of a fishbone that penetrated the tongue and moved toward the hyoid bone. An 84-year-old woman was referred to the department with the chief complaint of pain and swelling in her tongue. After anti-inflammatory therapy, a fishbone-like foreign body was detected in the tongue through computed tomographic and ultrasonographic examinations. Since a CT scan performed the day before the operation had revealed that the foreign body had moved from the dorsum of the tongue to near the hyoid bone, it was removed by means of a skin incision, using intraoperative ultrasonography under general anesthesia. The removed foreign body was a needle-shaped 25 mm fishbone. There was no postoperative infection or other complication. In conclusion, it is important to obtain a detailed medical history and to use imaging for detecting foreign bodies in soft tissue and determining their position. Furthermore, it is vital to reconfirm the position just before the operation. Intraoperative ultrasonography is useful for improving the accuracy of the operation because it enables detection of the foreign body in real time.