We report long-term survival of very rare metastatic involvement and an unusual course of recurrent stage IIB lung adenocarcinoma. Nine months after surgery for stage IIB primary lung adenocarcinoma, a 64-year-old Japanese man was found to have a nodule in the abdominal rectus muscle, diagnosed histologically as carcinoma metastasizing from the lung. Through combined chemotherapy and subsequent radiotherapy, complete response of the metastatic lesion was achieved without serious adverse effects. Results continue to be favorable more than 7 years and 11 months following sequential chemoradiotherapy and 9 years and 4 months after surgery. Sequential chemoradiotherapy appears to have favorably affected this man's survival despite metachronous metastasis to the abdominal rectus muscle after complete resection for stage IIB primary lung adenocarcinoma.