Ovarian yolk sac tumors are common germ cell tumors usually arising in young women. Yolk sac tumors in elderly women are infrequently encountered and most of them are combined with other epithelial tumor components including endometrioid carcinoma or serous carcinoma. Here, we report an extremely rare case of a yolk sac tumor with mucinous tumor and large cell neuroendocrine carcinoma components in a postmenopausal woman, which is the third yolk sac tumor case with a neuroendocrine tumor element in an elderly woman. An 82-year-old female visited our hospital due to abdominal distention. Abdominal computed tomography (CT) demonstrated a solid and cystic mass, measuring about 9.0 cm in the largest diameter. A total hysterectomy with bilateral salpingo-oophorectomy and excisional biopsy of the peritoneal metastatic lesions was performed. Histologic evaluation revealed a malignant ovarian tumor composed of a variety of tumor components, including a yolk sac tumor, a mucinous tumor with multifocal mucinous carcinomatous areas, and a large-cell neuroendocrine carcinoma. After surgery, the patient refused further treatment and the disease recurred in the pelvic peritoneum and a left supraclavicular lymph node nine months later.