In this paper, we estimate the size of economic rent in Iran's automotive industry over the period 1386Q1-1394Q4. For studying the economic rent empirically, measure the economic rent directly is the most important problem. Then Researchers use different proxies for this variable. In order order to estimate the economic rent in the automotive industry, we use two groups of variables, including the causes' variables that include: Loans, Tax, Size of government, Oil revenues, GDP, Receivable accounts from group companies and affiliates, Cash and balances with banks, pre paids, received long-term trade accounts and notes, Inventories, Exchange rate, Inflation and reflect variables include: Sale, accumulated Profit and loss, Cost of goods sold. For this purpose, with using different variables, various combinations of variables are examined. In the optimum model which is selected base on fitting model criteria, all variables are statistically significant. Moreover, results of this paper show that changes in economic rent in the Automotive Industry during the years 1394-1386 encountered by leaps and bounds.