A 67-year-old man had been suffering from membranous nephropathy and sensory neuropathy for 1 year. He was at first suspected of paraneoplastic syndrome, so a systemic examination was performed. But a tumor was not detected. He was treated with glucocorticoid and intravenous immunogloblin for sensory neuropathy. But there was little effectivity. More than one year after he diagnosed sensory neuropathy and membrous nephropathy, a CT scan was performed again, and it showed left lower lobe nodule and mediastinal lymph node swelling. As the result of transbronchial lung biopsy, he was given a diagnosis of small cell lung cancer. The clinical stage was cT1aN3M1b-stage IV OSS. Anti-Hu antibody was checked and found positive. His sensory neuropathy was diagnosed as paraneoplastic neurological syndrome complicated by small cell lung cancer. He was treated with chemotherapy, and a clinically complete response was obtained. Nephrosis was remitted, but sensory disorder was not. He has visited our hospital regularly without recurrence of his cancer. We reported a case in which two types of paraneoplastic syndrome were complicated.