We present three rare cases of fetal cardiac tumor. Case 1: A 30-year-old multipara was referred to our hospital at 38 weeks pregnant. Fetal ultrasonographic examination revealed a homogeneous, hyperechogenic tumor in the left ventricle (13 mm in diameter). A part of the tumor protruded into the ascending aorta. A male neonate (gestational age 39 weeks and 1 day, weight 3,966 g) was born via vaginal delivery. Tumor resection was performed at the age of 1 day, and the histopathological diagnosis was rhabdomyoma. Brain MRI confirmed tuberous sclerosis at the age of two and a half months. He had epilepsy. The tumor has not recurred as of age 5 years. Case 2: A 30-year-old multipara was referred to our hospital at 29 weeks and 5 days pregnant because of three homogeneous, hyperechogenic tumors in the fetal left ventricle, right ventricle, and right atrium (14 mm, 17 mm, and 5 mm in diameter, respectively). A female neonate (gestational age 39 weeks and 5 days, weight 2,866 g) was born via vaginal delivery. She was diagnosed with tuberous sclerosis by brain CT at the age of 3 days. She had epilepsy. The sizes of the tumors have not changed as of age 3 years. Case 3: A 36-year-old primipara was referred to our hospital at 19 weeks and 5 days pregnant because of a homogeneous, hyperechogenic tumor in the fetal left ventricle (10 mm in diameter). A female neonate (gestational age 37 weeks 4 days, weight 3,006 g) was born via vaginal delivery. Ventricular tachycardia appeared at the age of 13 days. The size of the tumor has not changed as of age 9 months. Factors for poor prognosis of fetal cardiac tumor include tumor size of 20 mm or larger, fetal arrhythmia, and hydrops fetalis. This study contributes to the further investigation of prognostic factors.