The authors report one case of a bilateral testicular Leydig cell tumor in a man of 29 years old. There are few cases of such tumors reported in the literature. Gynecomastia force the patient to consult his doctor. His hormonal profile is practically normal; however, the serum estradiol is at the limit superior of normal range, and serum testosterone at the limit inferior. Testicular palpation is normal. It is the scrotal ultrasonography which confirms the diagnosis of testicular tumor. The scrotal ultrasonography has to be performed in every patient with unexplained gynecomastia. There is no metastasis. Before the treatment, the sperm conservation is performed (his sperm is normal). Our surgical sequence for this man without children was the next one: 1. inguinal orchiectomy was performed at the side of bigger tumor. Histological diagnosis was the benign Leydig cell tumor; 2. one month later, an inguinal orchidotomy at the other side was performed and the tumor palpable of 9 mm was removed. The extemporaneous biopsy confirmed the same diagnosis as at the other side; 3. one year later, there is no metastasis and the woman of our patient becomes pregnant.