Traffic accidents caused by elderly drivers have been increasing in Japan. This research aims to investigate the relationships between unsafe driving behavior and simple battery of cognitive tests, which are the Speed Anticipation Reaction Test (SART) and the Trail Making Test Part B (TMT-B). Total 68 elderly drivers' naturalistic driving behavior were surveyed using driving recorders with 4 cameras and GPS. We aggregated unsafe behaviors using the data. The study categorized elderly drivers based on the score of SART and TMT-B, into nine types. The result indicated specific categories are associated with a high frequency of unsafe driving behavior.