An oversea investigation was made in 1988 to study the present situation of the relaxation trends of petroleum resrictions in the countries of Western Europe. Among petroleum markets of West European countries, in those of West Germany and UK both quantity and price have had no restrictions. And in France they were liberalized quite recently. On the other hand, in South European countries such as Italy, Spain and Greece the prices of petroleum products are controlled by the governments. EC is going to integrate petroleum markets by the end of 1992 so that petroleum products may flow beyond the borders freely. In France, relaxation of restrictions on the petroleum industry was carried out in 1985 employing the petroleum business law of 1928 with elasticity and four years have passed since then. In Italy petroleum companies cannot decide the prices of major petroleum products freely. In Spain, the petroleum market is going to be completely liberalized in 1993 in accordance with the engagement with EC. Greece is at strife with EC on the adjustment of policies. 26 figs., 86 tabs.