We report a case of a traumatic dislocation of the testis in a 17-year-old male. He noticed lack of right scrotal contents three months after a motorcycle accident. The right testis, located at the inguinal subcutaneous region, was surgically replaced into the scrotum. The biopsy specimen of the dislocated testis showed partial atrophy of the seminiferous tubules that resulted in impaired spermatogenesis. Our case represents the 57th case of traumatic dislocation of the testis reported in Japan.