Rhabdomyosarcoma is relatively rare in general pediatric population. Furthermore, the primary site in the thorax is one of the least sites. Because most patient, when first seen, are extensively advanced and bad in prognosis, an adequate work-up prior to any definitive therapy must be undertaken. Author experienced 2 cases of embryonal rhabdomyosarcoma originating from chest wall. Both 2 cases are included in Group III [Rhabdomyosarcoma-Intergroup Protocol Grouping], one case is treated with radical surgery and radiation therapy, and the other case is treated with radiation therapy and chemotherapy. So author present 2 cases of embryonal rhabdomyosarcoma with reference.[KTCS 1978;4:451-455]