The author in this article aims to elaborate in briefly concerning definitions and purposes of legal opinion for the scholars and academicians in Indonesia. In Indonesian legal counselors habits legal opinion is not familiar known, Legal opinion itself has known in legal business practices by local legal counselors whom involved in international business transaction and dealt with foreigner's legal counselors. They have preserved on legal opinion as initial requirements (a condition precedent on the contract binding later which must be prepared and issued by In Indonesian legal counselors. This tradition has followed business practices in United States that has broadened to most of countries and without American legal counselors involved.