The head-on collision is the most frequent accident. Elderly drivers show the tendency to occur head-on collision, therefore, to clarify the principal accident causation of this collision is strongly required in our country which is an aging society. In the present study the driving data was classified into several patterns from each point of entering behavior, passing behavior and safety confirmation behavior. Then the differences between expert and elderly drivers were discussed, furthermore risk factors of elderly drivers were clarified by analyzing the patterns.