According to IRNA, Asia’s number two economy bought a daily volume of 230,000 barrels of oil last month, which shows a growth of 48 percent, compared to the figure for the same month last year.
The report citing data from a Chinese expert website for oil and energy added that this placed Iran as the fifth major supplier of crude oil to Japan.
Earlier this month Japan's Ministry of Economy, Trade, and Industry announced that Tokyo imported 26 percent more oil from Iran in 2015.
The world's third largest economy had imported 193.000 barrels per day of oil from Iran in January and 260,000 barrels per day in February.
The significant increase in Japan's oil import from Iran in February comes as the country's total oil imports witnessed a decline of 6 percent compared to the figure for the month before.
Iran supplied 6.7 percent of Japan's oil imports in February.