Spermatocytic seminoma is a rare germ cell tumor which was first described by Masson in 1946. We experienced a case of bilateral spermatocytic seminoma. A 56-year-old man presented with painless swelling of left scrotal contents. This patient was diagnosed with bilateral testicular tumor after various image examinations (ultrasonography/computerized tomography/magnetic resonance imaging) and bilateral high orchidectomy was performed. Histological diagnosis was bilateral spermatocytic seminoma, pT1. After the operation, this patient was followed closely without adjuvant therapy. There has been no sign of recurrence at five months after the operation.