Toyota Motor and Tokyo University collaborate to apply Toyota’s computer-aided simulation technology for auto body designing and production processing to the prediction system of subarachnoid bleeding. Because auto technology has rarely been applied to the medical field, this collaboration invites attention as an approach across two different industrial frameworks. Toyota simulates the running condition of a car and the safety in collision using computers, and Tokyo University’s Institute of Industrial Science uses Toyota’s technology to simulate the condition of blood vessels and the flow of blood of the brain, and looks into possible rupture of a cerebral aneurysm. Currently, it takes about 70 days to analyze the condition of a cerebral aneurysm, but Toyota’s technology of image processing and batch data processing is expected to shorten the time to several hours. About 2% of Japanese are supposed to have a cerebral aneurysm, and one third of them die should it be ruptured. Applying the technology of auto production is expected to increase the speed and accuracy of the analysis and increase the accuracy of decision making on the necessity of operation. In the future, the application will expand to other categories in the medical field.