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A 50-year-old man visited our clinic with the complaint of a painless, growing swelling in the left inguinal region. High inguinal orchiectomy including tumor resection was performed. The tumor originated in the spermatic cord without invading the epididymis or the testis. Histologically, the tumor consisted of osteosarcoma, leiomyosarcoma, and liposarcoma, which was compatible with the pathological finding of malignant mesenchymoma. Postoperatively, the patient received 2 courses of adjuvant chemotherapy according to the CYVADIC regimen. He is alive 12 months after surgery with no evidence of tumor recurrence or metastasis. Malignant tumors of the spermatic cord are rare, especially malignant mesenchymoma. Our case is the 7th one so far reported in Japan.