The two countries signed the treaty designed to protect investments by Japanese companies across various sectors of the Iranian economy in February 2016.
The treaty is seen as a tailwind for Japanese companies considering investments, including midstream petroleum businesses, in the Islamic Republic, a source at the Japanese Ministry of Economy, Trade and Industry said earlier.
Possible Japanese investment in Iran could include petroleum, natural gas resource development, refinery and petrochemical projects, according to industry sources, Financial Tribune reported.