Many vehicles scraped in Japan are exported to East Asia as used cars, used parts and materiaL These vehicles cause environmental problems due to change of operation environment, inadequate inspection system ad lack of proper recycling at the usage and disposal stage in East Asia This paper aims to develop on estimation method of vehicle ownership and end vehicle scrap considering interregional used car flows. First, we devise the estimation method and examine accuracy of this method using Japan data Next, we analyze an impact of vehicle ownership and vehicle scrap on income, dismantler cost and transport cost through inter-regional used car flows using this method.