Inguinoscrotal bladder hernia is relatively common in obese males over 50 years old, especially patients with benign prostate hyperplasia. Various imaging modalities are used for diagnosis of inguinoscrotal bladder hernia. In particular, ultrasonography has many benefits, including non-invasiveness, and the fact that it does not require exposure to radiation; however, no domestic cases of ultrasonographic diagnosis of inguinoscrotal bladder hernia have been reported. The authors report on a case of a 67-year-old male patient with right scrotal swelling diagnosed as inguinoscrotal bladder hernia by ultrasonography, including three-dimensional imaging. Findings on ultrasonography showed a sacular lesion in the scrotum, which was connected to the urinary bladder through the inguinal canal; additional findings on CT, PET, and cystography showed that the entire lesion had a dumbbell shape.