An autopsy case of Gaucher's disease (adult type) was reported. A 39-years-old man was admitted to our hospital because of dyspnea. Splenomegaly was documented when he was 3-years-old. Physical examination revealed generalized edema, kyphoscoliosis and giant splenomegaly. Any abnormal neurological findings could not detected. Bone marrow aspiration biopsy revealed several clusters of Gaucher cells with “wrinkled tissue paper” like cytoplasm and round eccentric nucleus. The acid phosphatase activity in the serum increased to 38.5u/l, whereas the angiotensin converting enzyme activity was normal, perhaps because of steroid therapy. Inspite of intensive treatement, he died of respiratory failure.Autopsy findings revealed that Gaucher cells had proliferated in spleen, liver, bone marrow and lungs. Histochemically, these cells were positive stainini for acid phosphatase, PAS, Naphthol-AS-D-chloroacetate and negative for lysozyme. Electron microscopically, characteristic spindle-shaped and membrane-delimitted inclusion bodies were observed within the cytoplasm of the cells.Biochemically, the amount of glucocerebroside extracted from autopsy liver and spleen was greatly increased and the activity of glucocerebrosidase in his cultured skin fibroblasts were markedly low comparing with normal volunteers, confirming that the defect of this enzyme was the cause of this disorder.In Japan there were only eight cases of this disease (adult type) reported.